fix: revert back original logic to fix rescheduling of single event, will revisit possible issue that this causes

Author: carddev81

frontend/src/Components/modals/RescheduleClassEventModal.tsx

@@ -84,9 +84,16 @@ export const RescheduleClassEventModal = forwardRef(function (
         }
 
         //reschedule logic
-        const dateStr = (data.date as string).replace(/-/g, '');
-        const timeStr = (data.start_time as string).replace(':', '') + '00';
-        const rescheduledRule = `DTSTART;TZID=${user.timezone}:${dateStr}T${timeStr}\nRRULE:FREQ=DAILY;COUNT=1`;
+        const timeZoneStartDateTime = fromZonedTime(
+            `${data.date}T${data.start_time}`,
+            user.timezone
+        );
+
+        const rescheduledRule = new RRule({
+            freq: RRule.DAILY,
+            count: 1,
+            dtstart: timeZoneStartDateTime
+        }).toString();
         const duration = formatDuration(
             data.start_time as string,
             data.end_time as string