diff --git a/__test__/features/Events/eventUtils.test.ts b/__test__/features/Events/eventUtils.test.ts
index a379a30..1411b44 100644
--- a/__test__/features/Events/eventUtils.test.ts
+++ b/__test__/features/Events/eventUtils.test.ts
@@ -189,6 +189,39 @@ describe("parseCalendarEvent", () => {
     expect(result2.error).toMatch(/missing crucial event param/);
   });
 
+  it("returns computed end when there is no end but a duration", () => {
+    jest.useFakeTimers().setSystemTime(new Date("2025-07-18T00:00:00Z"));
+
+    const rawDataMissing: any = [
+      ["UID", {}, "text", "event-1"],
+      ["DTSTART", {}, "date-time", "2025-07-18T09:00:00"],
+      ["duration", {}, "duration", "PT60M"],
+    ];
+
+    const result = parseCalendarEvent(
+      rawDataMissing,
+      baseColor,
+      calendarId,
+      "/calendars/test.ics"
+    );
+    expect(result.end).toBe("2025-07-18T10:00:00");
+  });
+
+  it("returns error if end and duration is missing", () => {
+    const rawDataMissing: any = [
+      ["UID", {}, "text", "event-1"],
+      ["DTSTART", {}, "date-time", "2025-07-18T09:00:00Z"],
+    ];
+
+    const result = parseCalendarEvent(
+      rawDataMissing,
+      baseColor,
+      calendarId,
+      "/calendars/test.ics"
+    );
+    expect(result.error).toMatch(/missing crucial event param/);
+  });
+
   it("parses alarm block correctly", () => {
     const rawData = [
       ["UID", {}, "text", "event-5"],
@@ -289,7 +322,7 @@ describe("calendarEventToJCal", () => {
       ],
     };
 
-    const result = calendarEventToJCal(mockEvent as CalendarEvent);
+    const result = calendarEventToJCal(mockEvent as unknown as CalendarEvent);
 
     expect(result[0]).toBe("vcalendar");
     const [vevent, vtimezone] = result[2];
@@ -449,7 +482,7 @@ describe("calendarEventToJCal", () => {
       ],
     };
 
-    const result = calendarEventToJCal(mockEvent as CalendarEvent);
+    const result = calendarEventToJCal(mockEvent as unknown as CalendarEvent);
 
     expect(result[0]).toBe("vcalendar");
     const [vevent, vtimezone] = result[2];
@@ -539,7 +572,7 @@ describe("calendarEventToJCal", () => {
       attendee: [],
     };
 
-    const result = calendarEventToJCal(mockEvent as CalendarEvent);
+    const result = calendarEventToJCal(mockEvent as unknown as CalendarEvent);
 
     expect(result[0]).toBe("vcalendar");
     const [vevent, vtimezone] = result[2];
@@ -574,7 +607,7 @@ describe("calendarEventToJCal", () => {
       attendee: [],
     };
 
-    const result = calendarEventToJCal(mockEvent as CalendarEvent);
+    const result = calendarEventToJCal(mockEvent as unknown as CalendarEvent);
 
     expect(result[0]).toBe("vcalendar");
     const [vevent, vtimezone] = result[2];
@@ -609,7 +642,7 @@ describe("calendarEventToJCal", () => {
       attendee: [],
     };
 
-    const result = calendarEventToJCal(mockEvent as CalendarEvent);
+    const result = calendarEventToJCal(mockEvent as unknown as CalendarEvent);
 
     expect(result[0]).toBe("vcalendar");
     const [vevent, vtimezone] = result[2];
@@ -644,7 +677,7 @@ describe("calendarEventToJCal", () => {
       attendee: [],
     };
 
-    const result = calendarEventToJCal(mockEvent as CalendarEvent);
+    const result = calendarEventToJCal(mockEvent as unknown as CalendarEvent);
 
     expect(result[0]).toBe("vcalendar");
     const [vevent, vtimezone] = result[2];
@@ -679,7 +712,7 @@ describe("calendarEventToJCal", () => {
       attendee: [],
     };
 
-    const result = calendarEventToJCal(mockEvent as CalendarEvent);
+    const result = calendarEventToJCal(mockEvent as unknown as CalendarEvent);
 
     expect(result[0]).toBe("vcalendar");
     const [vevent, vtimezone] = result[2];
diff --git a/package-lock.json b/package-lock.json
index 631eb7d..dd37470 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -25,6 +25,7 @@
         "i18next": "^23.7.9",
         "ical.js": "^2.2.0",
         "ky": "^1.8.1",
+        "moment": "^2.30.1",
         "openid-client": "^6.5.3",
         "react": "^19.1.0",
         "react-calendar": "^6.0.0",
@@ -3381,6 +3382,51 @@
         "url": "https://opencollective.com/pkgr"
       }
     },
+    "node_modules/@pnpm/config.env-replace": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@pnpm/config.env-replace/-/config.env-replace-1.1.0.tgz",
+      "integrity": "sha512-htyl8TWnKL7K/ESFa1oW2UB5lVDxuF5DpM7tBi6Hu2LNL3mWkIzNLG6N4zoCUP1lCKNxWy/3iu8mS8MvToGd6w==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12.22.0"
+      }
+    },
+    "node_modules/@pnpm/network.ca-file": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/@pnpm/network.ca-file/-/network.ca-file-1.0.2.tgz",
+      "integrity": "sha512-YcPQ8a0jwYU9bTdJDpXjMi7Brhkr1mXsXrUJvjqM2mQDgkRiz8jFaQGOdaLxgjtUfQgZhKy/O3cG/YwmgKaxLA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "graceful-fs": "4.2.10"
+      },
+      "engines": {
+        "node": ">=12.22.0"
+      }
+    },
+    "node_modules/@pnpm/network.ca-file/node_modules/graceful-fs": {
+      "version": "4.2.10",
+      "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.2.10.tgz",
+      "integrity": "sha512-9ByhssR2fPVsNZj478qUUbKfmL0+t5BDVyjShtyZZLiK7ZDAArFFfopyOTj0M05wE2tJPisA4iTnnXl2YoPvOA==",
+      "dev": true,
+      "license": "ISC"
+    },
+    "node_modules/@pnpm/npm-conf": {
+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/@pnpm/npm-conf/-/npm-conf-2.3.1.tgz",
+      "integrity": "sha512-c83qWb22rNRuB0UaVCI0uRPNRr8Z0FWnEIvT47jiHAmOIUHbBOg5XvV7pM5x+rKn9HRpjxquDbXYSXr3fAKFcw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@pnpm/config.env-replace": "^1.1.0",
+        "@pnpm/network.ca-file": "^1.0.1",
+        "config-chain": "^1.1.11"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/@polka/url": {
       "version": "1.0.0-next.29",
       "dev": true,
@@ -3714,14 +3760,6 @@
       "dev": true,
       "license": "MIT"
     },
-    "node_modules/@sindresorhus/is": {
-      "version": "0.14.0",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=6"
-      }
-    },
     "node_modules/@sinonjs/commons": {
       "version": "3.0.1",
       "dev": true,
@@ -3977,17 +4015,6 @@
         "tslib": "^2.8.0"
       }
     },
-    "node_modules/@szmarczak/http-timer": {
-      "version": "1.1.2",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "defer-to-connect": "^1.0.1"
-      },
-      "engines": {
-        "node": ">=6"
-      }
-    },
     "node_modules/@testing-library/dom": {
       "version": "10.4.0",
       "dev": true,
@@ -5124,6 +5151,8 @@
     },
     "node_modules/ansi-align": {
       "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/ansi-align/-/ansi-align-3.0.1.tgz",
+      "integrity": "sha512-IOfwwBF5iczOjp/WeY4YxyjqAFMQoZufdQWDd19SEExbVLNXqvpzSJ/M7Za4/sCPmQ0+GRquoA7bGcINcxew6w==",
       "dev": true,
       "license": "ISC",
       "dependencies": {
@@ -5376,6 +5405,16 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/atomically": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/atomically/-/atomically-2.0.3.tgz",
+      "integrity": "sha512-kU6FmrwZ3Lx7/7y3hPS5QnbJfaohcIul5fGqf7ok+4KklIEk9tJ0C2IQPdacSbVUWv6zVHXEBWoWd6NrVMT7Cw==",
+      "dev": true,
+      "dependencies": {
+        "stubborn-fs": "^1.2.5",
+        "when-exit": "^2.1.1"
+      }
+    },
     "node_modules/available-typed-arrays": {
       "version": "1.0.7",
       "dev": true,
@@ -5615,26 +5654,152 @@
       "license": "ISC"
     },
     "node_modules/boxen": {
-      "version": "5.1.2",
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/boxen/-/boxen-8.0.1.tgz",
+      "integrity": "sha512-F3PH5k5juxom4xktynS7MoFY+NUWH5LC4CnH11YB8NPew+HLpmBLCybSAEyb2F+4pRXhuhWqFesoQd6DAyc2hw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "ansi-align": "^3.0.0",
-        "camelcase": "^6.2.0",
-        "chalk": "^4.1.0",
-        "cli-boxes": "^2.2.1",
-        "string-width": "^4.2.2",
-        "type-fest": "^0.20.2",
-        "widest-line": "^3.1.0",
-        "wrap-ansi": "^7.0.0"
+        "ansi-align": "^3.0.1",
+        "camelcase": "^8.0.0",
+        "chalk": "^5.3.0",
+        "cli-boxes": "^3.0.0",
+        "string-width": "^7.2.0",
+        "type-fest": "^4.21.0",
+        "widest-line": "^5.0.0",
+        "wrap-ansi": "^9.0.0"
       },
       "engines": {
-        "node": ">=10"
+        "node": ">=18"
       },
       "funding": {
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/boxen/node_modules/ansi-regex": {
+      "version": "6.2.2",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-6.2.2.tgz",
+      "integrity": "sha512-Bq3SmSpyFHaWjPk8If9yc6svM8c56dB5BAtW4Qbw5jHTwwXXcTLoRMkpDJp6VL0XzlWaCHTXrkFURMYmD0sLqg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-regex?sponsor=1"
+      }
+    },
+    "node_modules/boxen/node_modules/ansi-styles": {
+      "version": "6.2.3",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-6.2.3.tgz",
+      "integrity": "sha512-4Dj6M28JB+oAH8kFkTLUo+a2jwOFkuqb3yucU0CANcRRUbxS0cP0nZYCGjcc3BNXwRIsUVmDGgzawme7zvJHvg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
+    "node_modules/boxen/node_modules/camelcase": {
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-8.0.0.tgz",
+      "integrity": "sha512-8WB3Jcas3swSvjIeA2yvCJ+Miyz5l1ZmB6HFb9R1317dt9LCQoswg/BGrmAmkWVEszSrrg4RwmO46qIm2OEnSA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=16"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/boxen/node_modules/chalk": {
+      "version": "5.6.2",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-5.6.2.tgz",
+      "integrity": "sha512-7NzBL0rN6fMUW+f7A6Io4h40qQlG+xGmtMxfbnH/K7TAtt8JQWVQK+6g0UXKMeVJoyV5EkkNsErQ8pVD3bLHbA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^12.17.0 || ^14.13 || >=16.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/chalk?sponsor=1"
+      }
+    },
+    "node_modules/boxen/node_modules/emoji-regex": {
+      "version": "10.5.0",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-10.5.0.tgz",
+      "integrity": "sha512-lb49vf1Xzfx080OKA0o6l8DQQpV+6Vg95zyCJX9VB/BqKYlhG7N4wgROUUHRA+ZPUefLnteQOad7z1kT2bV7bg==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/boxen/node_modules/string-width": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-7.2.0.tgz",
+      "integrity": "sha512-tsaTIkKW9b4N+AEj+SVA+WhJzV7/zMhcSu78mLKWSk7cXMOSHsBKFWUs0fWwq8QyK3MgJBQRX6Gbi4kYbdvGkQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "emoji-regex": "^10.3.0",
+        "get-east-asian-width": "^1.0.0",
+        "strip-ansi": "^7.1.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/boxen/node_modules/strip-ansi": {
+      "version": "7.1.2",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-7.1.2.tgz",
+      "integrity": "sha512-gmBGslpoQJtgnMAvOVqGZpEz9dyoKTCzy2nfz/n8aIFhN/jCE/rCmcxabB6jOOHV+0WNnylOxaxBQPSvcWklhA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ansi-regex": "^6.0.1"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/strip-ansi?sponsor=1"
+      }
+    },
+    "node_modules/boxen/node_modules/type-fest": {
+      "version": "4.41.0",
+      "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-4.41.0.tgz",
+      "integrity": "sha512-TeTSQ6H5YHvpqVwBRcnLDCBnDOHWYu7IvGbHT6N8AOymcr9PJGjc1GTtiWZTYg0NCgYwvnYWEkVChQAr9bjfwA==",
+      "dev": true,
+      "license": "(MIT OR CC0-1.0)",
+      "engines": {
+        "node": ">=16"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/boxen/node_modules/wrap-ansi": {
+      "version": "9.0.2",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-9.0.2.tgz",
+      "integrity": "sha512-42AtmgqjV+X1VpdOfyTGOYRi0/zsoLqtXQckTmqTeybT+BDIbM/Guxo7x3pE2vtpr1ok6xRqM9OpBe+Jyoqyww==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ansi-styles": "^6.2.1",
+        "string-width": "^7.0.0",
+        "strip-ansi": "^7.1.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
+      }
+    },
     "node_modules/brace-expansion": {
       "version": "1.1.12",
       "dev": true,
@@ -5710,58 +5875,6 @@
       "dev": true,
       "license": "MIT"
     },
-    "node_modules/cacheable-request": {
-      "version": "6.1.0",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "clone-response": "^1.0.2",
-        "get-stream": "^5.1.0",
-        "http-cache-semantics": "^4.0.0",
-        "keyv": "^3.0.0",
-        "lowercase-keys": "^2.0.0",
-        "normalize-url": "^4.1.0",
-        "responselike": "^1.0.2"
-      },
-      "engines": {
-        "node": ">=8"
-      }
-    },
-    "node_modules/cacheable-request/node_modules/get-stream": {
-      "version": "5.2.0",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "pump": "^3.0.0"
-      },
-      "engines": {
-        "node": ">=8"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/sindresorhus"
-      }
-    },
-    "node_modules/cacheable-request/node_modules/json-buffer": {
-      "version": "3.0.0",
-      "dev": true,
-      "license": "MIT"
-    },
-    "node_modules/cacheable-request/node_modules/keyv": {
-      "version": "3.1.0",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "json-buffer": "3.0.0"
-      }
-    },
-    "node_modules/cacheable-request/node_modules/lowercase-keys": {
-      "version": "2.0.0",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=8"
-      }
-    },
     "node_modules/call-bind": {
       "version": "1.0.8",
       "dev": true,
@@ -5920,11 +6033,13 @@
       "license": "MIT"
     },
     "node_modules/cli-boxes": {
-      "version": "2.2.1",
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/cli-boxes/-/cli-boxes-3.0.0.tgz",
+      "integrity": "sha512-/lzGpEWL/8PfI0BmBOPRwp0c/wFNX1RdUML3jK/RcSBA9T8mZDdQpqYBKtCFTOfQbwPqWEOpjqW+Fnayc0969g==",
       "dev": true,
       "license": "MIT",
       "engines": {
-        "node": ">=6"
+        "node": ">=10"
       },
       "funding": {
         "url": "https://github.com/sponsors/sindresorhus"
@@ -5943,17 +6058,6 @@
         "node": ">=12"
       }
     },
-    "node_modules/clone-response": {
-      "version": "1.0.3",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "mimic-response": "^1.0.0"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/sindresorhus"
-      }
-    },
     "node_modules/clsx": {
       "version": "2.1.1",
       "license": "MIT",
@@ -6004,31 +6108,31 @@
       "dev": true,
       "license": "MIT"
     },
-    "node_modules/configstore": {
-      "version": "5.0.1",
-      "dev": true,
-      "license": "BSD-2-Clause",
-      "dependencies": {
-        "dot-prop": "^5.2.0",
-        "graceful-fs": "^4.1.2",
-        "make-dir": "^3.0.0",
-        "unique-string": "^2.0.0",
-        "write-file-atomic": "^3.0.0",
-        "xdg-basedir": "^4.0.0"
-      },
-      "engines": {
-        "node": ">=8"
-      }
-    },
-    "node_modules/configstore/node_modules/make-dir": {
-      "version": "3.1.0",
+    "node_modules/config-chain": {
+      "version": "1.1.13",
+      "resolved": "https://registry.npmjs.org/config-chain/-/config-chain-1.1.13.tgz",
+      "integrity": "sha512-qj+f8APARXHrM0hraqXYb2/bOVSV4PvJQlNZ/DVj0QrmNM2q2euizkeuVckQ57J+W0mRH6Hvi+k50M4Jul2VRQ==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "semver": "^6.0.0"
+        "ini": "^1.3.4",
+        "proto-list": "~1.2.1"
+      }
+    },
+    "node_modules/configstore": {
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/configstore/-/configstore-7.1.0.tgz",
+      "integrity": "sha512-N4oog6YJWbR9kGyXvS7jEykLDXIE2C0ILYqNBZBp9iwiJpoCBWYsuAdW6PPFn6w06jjnC+3JstVvWHO4cZqvRg==",
+      "dev": true,
+      "license": "BSD-2-Clause",
+      "dependencies": {
+        "atomically": "^2.0.3",
+        "dot-prop": "^9.0.0",
+        "graceful-fs": "^4.2.11",
+        "xdg-basedir": "^5.1.0"
       },
       "engines": {
-        "node": ">=8"
+        "node": ">=18"
       },
       "funding": {
         "url": "https://github.com/sponsors/sindresorhus"
@@ -6136,14 +6240,6 @@
         "node": ">= 8"
       }
     },
-    "node_modules/crypto-random-string": {
-      "version": "2.0.0",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=8"
-      }
-    },
     "node_modules/css-select": {
       "version": "5.2.2",
       "dev": true,
@@ -6318,17 +6414,6 @@
       "dev": true,
       "license": "MIT"
     },
-    "node_modules/decompress-response": {
-      "version": "3.3.0",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "mimic-response": "^1.0.0"
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     "node_modules/pure-rand": {
@@ -11624,6 +11676,8 @@
     },
     "node_modules/rc": {
       "version": "1.2.8",
+      "resolved": "https://registry.npmjs.org/rc/-/rc-1.2.8.tgz",
+      "integrity": "sha512-y3bGgqKj3QBdxLbLkomlohkvsA8gdAiUQlSBJnBhfn+BPxg4bc62d8TcBW15wavDfgexCgccckhcZvywyQYPOw==",
       "dev": true,
       "license": "(BSD-2-Clause OR MIT OR Apache-2.0)",
       "dependencies": {
@@ -11638,6 +11692,8 @@
     },
     "node_modules/rc/node_modules/strip-json-comments": {
       "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
+      "integrity": "sha512-4gB8na07fecVVkOI6Rs4e7T6NOTki5EmL7TUduTs6bu3EdnSycntVJ4re8kgZA+wx9IueI2Y11bfbgwtzuE0KQ==",
       "dev": true,
       "license": "MIT",
       "engines": {
@@ -11909,25 +11965,32 @@
       }
     },
     "node_modules/registry-auth-token": {
-      "version": "4.2.2",
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/registry-auth-token/-/registry-auth-token-5.1.0.tgz",
+      "integrity": "sha512-GdekYuwLXLxMuFTwAPg5UKGLW/UXzQrZvH/Zj791BQif5T05T0RsaLfHc9q3ZOKi7n+BoprPD9mJ0O0k4xzUlw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@pnpm/npm-conf": "^2.1.0"
+      },
+      "engines": {
+        "node": ">=14"
+      }
+    },
+    "node_modules/registry-url": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/registry-url/-/registry-url-6.0.1.tgz",
+      "integrity": "sha512-+crtS5QjFRqFCoQmvGduwYWEBng99ZvmFvF+cUJkGYF1L1BfU8C6Zp9T7f5vPAwyLkUExpvK+ANVZmGU49qi4Q==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
         "rc": "1.2.8"
       },
       "engines": {
-        "node": ">=6.0.0"
-      }
-    },
-    "node_modules/registry-url": {
-      "version": "5.1.0",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "rc": "^1.2.8"
+        "node": ">=12"
       },
-      "engines": {
-        "node": ">=8"
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
       }
     },
     "node_modules/regjsgen": {
@@ -12025,14 +12088,6 @@
         "node": ">=4"
       }
     },
-    "node_modules/responselike": {
-      "version": "1.0.2",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "lowercase-keys": "^1.0.0"
-      }
-    },
     "node_modules/reusify": {
       "version": "1.1.0",
       "dev": true,
@@ -12167,17 +12222,6 @@
         "semver": "bin/semver.js"
       }
     },
-    "node_modules/semver-diff": {
-      "version": "3.1.1",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "semver": "^6.3.0"
-      },
-      "engines": {
-        "node": ">=8"
-      }
-    },
     "node_modules/set-function-length": {
       "version": "1.2.2",
       "dev": true,
@@ -12645,6 +12689,12 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/stubborn-fs": {
+      "version": "1.2.5",
+      "resolved": "https://registry.npmjs.org/stubborn-fs/-/stubborn-fs-1.2.5.tgz",
+      "integrity": "sha512-H2N9c26eXjzL/S/K+i/RHHcFanE74dptvvjM8iwzwbVcWY/zjBbgRqF3K0DY4+OD+uTTASTBvDoxPDaPN02D7g==",
+      "dev": true
+    },
     "node_modules/stylis": {
       "version": "4.2.0",
       "license": "MIT"
@@ -12883,14 +12933,6 @@
       "dev": true,
       "license": "BSD-3-Clause"
     },
-    "node_modules/to-readable-stream": {
-      "version": "1.0.0",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=6"
-      }
-    },
     "node_modules/to-regex-range": {
       "version": "5.0.1",
       "dev": true,
@@ -13223,14 +13265,6 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
-    "node_modules/typedarray-to-buffer": {
-      "version": "3.1.5",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "is-typedarray": "^1.0.0"
-      }
-    },
     "node_modules/typescript": {
       "version": "4.9.5",
       "license": "Apache-2.0",
@@ -13295,17 +13329,6 @@
         "node": ">=4"
       }
     },
-    "node_modules/unique-string": {
-      "version": "2.0.0",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "crypto-random-string": "^2.0.0"
-      },
-      "engines": {
-        "node": ">=8"
-      }
-    },
     "node_modules/unpipe": {
       "version": "1.0.0",
       "dev": true,
@@ -13377,34 +13400,47 @@
       }
     },
     "node_modules/update-notifier": {
-      "version": "5.1.0",
+      "version": "7.3.1",
+      "resolved": "https://registry.npmjs.org/update-notifier/-/update-notifier-7.3.1.tgz",
+      "integrity": "sha512-+dwUY4L35XFYEzE+OAL3sarJdUioVovq+8f7lcIJ7wnmnYQV5UD1Y/lcwaMSyaQ6Bj3JMj1XSTjZbNLHn/19yA==",
       "dev": true,
       "license": "BSD-2-Clause",
       "dependencies": {
-        "boxen": "^5.0.0",
-        "chalk": "^4.1.0",
-        "configstore": "^5.0.1",
-        "has-yarn": "^2.1.0",
-        "import-lazy": "^2.1.0",
-        "is-ci": "^2.0.0",
-        "is-installed-globally": "^0.4.0",
-        "is-npm": "^5.0.0",
-        "is-yarn-global": "^0.3.0",
-        "latest-version": "^5.1.0",
-        "pupa": "^2.1.1",
-        "semver": "^7.3.4",
-        "semver-diff": "^3.1.1",
-        "xdg-basedir": "^4.0.0"
+        "boxen": "^8.0.1",
+        "chalk": "^5.3.0",
+        "configstore": "^7.0.0",
+        "is-in-ci": "^1.0.0",
+        "is-installed-globally": "^1.0.0",
+        "is-npm": "^6.0.0",
+        "latest-version": "^9.0.0",
+        "pupa": "^3.1.0",
+        "semver": "^7.6.3",
+        "xdg-basedir": "^5.1.0"
       },
       "engines": {
-        "node": ">=10"
+        "node": ">=18"
       },
       "funding": {
         "url": "https://github.com/yeoman/update-notifier?sponsor=1"
       }
     },
+    "node_modules/update-notifier/node_modules/chalk": {
+      "version": "5.6.2",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-5.6.2.tgz",
+      "integrity": "sha512-7NzBL0rN6fMUW+f7A6Io4h40qQlG+xGmtMxfbnH/K7TAtt8JQWVQK+6g0UXKMeVJoyV5EkkNsErQ8pVD3bLHbA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^12.17.0 || ^14.13 || >=16.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/chalk?sponsor=1"
+      }
+    },
     "node_modules/update-notifier/node_modules/semver": {
-      "version": "7.7.2",
+      "version": "7.7.3",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.3.tgz",
+      "integrity": "sha512-SdsKMrI9TdgjdweUSR9MweHA4EJ8YxHn8DFaDisvhVlUOe4BF1tLD7GAj0lIqWVl+dPb/rExr0Btby5loQm20Q==",
       "dev": true,
       "license": "ISC",
       "bin": {
@@ -13422,17 +13458,6 @@
         "punycode": "^2.1.0"
       }
     },
-    "node_modules/url-parse-lax": {
-      "version": "3.0.0",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "prepend-http": "^2.0.0"
-      },
-      "engines": {
-        "node": ">=4"
-      }
-    },
     "node_modules/use-sync-external-store": {
       "version": "1.5.0",
       "license": "MIT",
@@ -13546,6 +13571,13 @@
         "node": ">=18"
       }
     },
+    "node_modules/when-exit": {
+      "version": "2.1.4",
+      "resolved": "https://registry.npmjs.org/when-exit/-/when-exit-2.1.4.tgz",
+      "integrity": "sha512-4rnvd3A1t16PWzrBUcSDZqcAmsUIy4minDXT/CZ8F2mVDgd65i4Aalimgz1aQkRGU0iH5eT5+6Rx2TK8o443Pg==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/which": {
       "version": "2.0.2",
       "dev": true,
@@ -13642,14 +13674,73 @@
       }
     },
     "node_modules/widest-line": {
-      "version": "3.1.0",
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/widest-line/-/widest-line-5.0.0.tgz",
+      "integrity": "sha512-c9bZp7b5YtRj2wOe6dlj32MK+Bx/M/d+9VB2SHM1OtsUHR0aV0tdP6DWh/iMt0kWi1t5g1Iudu6hQRNd1A4PVA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "string-width": "^4.0.0"
+        "string-width": "^7.0.0"
       },
       "engines": {
-        "node": ">=8"
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/widest-line/node_modules/ansi-regex": {
+      "version": "6.2.2",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-6.2.2.tgz",
+      "integrity": "sha512-Bq3SmSpyFHaWjPk8If9yc6svM8c56dB5BAtW4Qbw5jHTwwXXcTLoRMkpDJp6VL0XzlWaCHTXrkFURMYmD0sLqg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-regex?sponsor=1"
+      }
+    },
+    "node_modules/widest-line/node_modules/emoji-regex": {
+      "version": "10.5.0",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-10.5.0.tgz",
+      "integrity": "sha512-lb49vf1Xzfx080OKA0o6l8DQQpV+6Vg95zyCJX9VB/BqKYlhG7N4wgROUUHRA+ZPUefLnteQOad7z1kT2bV7bg==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/widest-line/node_modules/string-width": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-7.2.0.tgz",
+      "integrity": "sha512-tsaTIkKW9b4N+AEj+SVA+WhJzV7/zMhcSu78mLKWSk7cXMOSHsBKFWUs0fWwq8QyK3MgJBQRX6Gbi4kYbdvGkQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "emoji-regex": "^10.3.0",
+        "get-east-asian-width": "^1.0.0",
+        "strip-ansi": "^7.1.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/widest-line/node_modules/strip-ansi": {
+      "version": "7.1.2",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-7.1.2.tgz",
+      "integrity": "sha512-gmBGslpoQJtgnMAvOVqGZpEz9dyoKTCzy2nfz/n8aIFhN/jCE/rCmcxabB6jOOHV+0WNnylOxaxBQPSvcWklhA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ansi-regex": "^6.0.1"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/strip-ansi?sponsor=1"
       }
     },
     "node_modules/word-wrap": {
@@ -13698,17 +13789,6 @@
       "dev": true,
       "license": "ISC"
     },
-    "node_modules/write-file-atomic": {
-      "version": "3.0.3",
-      "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "imurmurhash": "^0.1.4",
-        "is-typedarray": "^1.0.0",
-        "signal-exit": "^3.0.2",
-        "typedarray-to-buffer": "^3.1.5"
-      }
-    },
     "node_modules/ws": {
       "version": "8.18.3",
       "dev": true,
@@ -13730,11 +13810,16 @@
       }
     },
     "node_modules/xdg-basedir": {
-      "version": "4.0.0",
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/xdg-basedir/-/xdg-basedir-5.1.0.tgz",
+      "integrity": "sha512-GCPAHLvrIH13+c0SuacwvRYj2SxJXQ4kaVTT5xgL3kPrz56XxkF21IGhjSE1+W0aw7gpBWRGXLCPnPby6lSpmQ==",
       "dev": true,
       "license": "MIT",
       "engines": {
-        "node": ">=8"
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
       }
     },
     "node_modules/xml-name-validator": {
diff --git a/package.json b/package.json
index add7a3e..271b813 100644
--- a/package.json
+++ b/package.json
@@ -20,6 +20,7 @@
     "i18next": "^23.7.9",
     "ical.js": "^2.2.0",
     "ky": "^1.8.1",
+    "moment": "^2.30.1",
     "openid-client": "^6.5.3",
     "react": "^19.1.0",
     "react-calendar": "^6.0.0",
diff --git a/src/features/Events/eventUtils.ts b/src/features/Events/eventUtils.ts
index 288c8a0..00b5c7b 100644
--- a/src/features/Events/eventUtils.ts
+++ b/src/features/Events/eventUtils.ts
@@ -2,6 +2,7 @@ import { userAttendee } from "../User/userDataTypes";
 import { AlarmObject, CalendarEvent } from "./EventsTypes";
 import ICAL from "ical.js";
 import { TIMEZONES } from "../../utils/timezone-data";
+import moment from "moment";
 type RawEntry = [string, Record<string, string>, string, any];
 
 export function parseCalendarEvent(
@@ -13,6 +14,7 @@ export function parseCalendarEvent(
 ): CalendarEvent {
   const event: Partial<CalendarEvent> = { color, attendee: [] };
   let recurrenceId;
+  let duration;
   const dateRegex = /^\d{4}-(0[1-9]|1[0-2])-(0[1-9]|[12]\d|3[01])$/;
 
   for (const [key, params, , value] of data) {
@@ -86,6 +88,9 @@ export function parseCalendarEvent(
       case "status":
         event.status = String(value);
         break;
+      case "duration":
+        duration = String(value);
+        break;
       case "rrule":
         event.repetition = { freq: value.freq.toLowerCase() };
         if (value.byday) {
@@ -123,17 +128,18 @@ export function parseCalendarEvent(
   }
 
   event.URL = eventURL;
-  if (!event.uid || !event.start || !event.end) {
+  if (!event.uid || !event.start || (!event.end && !duration)) {
     console.error(
       `missing crucial event param in calendar ${calendarid} `,
       data
     );
     event.error = `missing crucial event param in calendar ${calendarid} `;
-    if (!event.end) {
-      const start = event.start ? new Date(event.start) : new Date();
-      const artificialEnd = new Date(start.getTime() + 3600000);
-      event.end = formatDateToICal(artificialEnd, false);
-    }
+  }
+  if (!event.end) {
+    const start = event.start ? new Date(event.start) : new Date();
+    const timeToAdd = moment.duration(duration).asMilliseconds();
+    const artificialEnd = new Date(start.getTime() + timeToAdd);
+    event.end = formatDateToICal(artificialEnd, false);
   }
 
   return event as CalendarEvent;