Added batch start and end date validation

lms/lms/doctype/lms_batch/lms_batch.py

@@ -23,6 +23,7 @@ class LMSBatch(Document):
 	def validate(self):
 		if self.seat_count:
 			self.validate_seats_left()
+		self.validate_batch_end_date():
 		self.validate_duplicate_courses()
 		self.validate_duplicate_students()
 		self.validate_duplicate_assessments()
@@ -31,6 +32,10 @@ class LMSBatch(Document):
 		self.send_confirmation_mail()
 		self.validate_evaluation_end_date()
 
+	def validate_batch_end_date(self):
+		if(self.end_date<self.start_date):
+			frappe.throw("Batch end date cannot be before the batch start date")
+
 	def validate_duplicate_students(self):
 		students = [row.student for row in self.students]
 		duplicates = {student for student in students if students.count(student) > 1}