fix: handle same start and end dates case for batch

* also minor refactor

frontend/src/utils/index.js

@@ -8,6 +8,7 @@ import Paragraph from '@editorjs/paragraph'
 import Embed from '@editorjs/embed'
 import NestedList from '@editorjs/nested-list'
 import { watch } from 'vue'
+import dayjs from '@/utils/dayjs'
 
 export function createToast(options) {
 	toast({
@@ -322,3 +323,12 @@ export function getSidebarLinks() {
 		},
 	]
 }
+
+export function getFormattedDateRange(startDate, endDate) {
+	if (startDate === endDate) {
+		return dayjs(startDate).format('DD MMM YYYY')
+	}
+	return `${dayjs(startDate).format('DD MMM YYYY')} - ${dayjs(endDate).format(
+		'DD MMM YYYY'
+	)}`
+}