This PR addresses an issue where null date/time values could cause exceptions when processing job scheduling.
Changes Made:
- Added proper null checks for _startDate, _startTime, _endDate, _endTime, _nextDate, and _nextTime
- Improved parsing safety for _retentionHistory using int.TryParse()
- Added validation to fail early with meaningful error messages
Impact:
Prevents NullReferenceException and InvalidOperationException when date/time fields are missing