Error Message :
U00011330 Task '' has not yet been executed and the new scheduled time lies in the past.
If Execute Once is selected for a Job and in the field At Date/Time a date is manually entered, the date picker fails.
The date cannot be manually entered when an object is executed with the 'Once' option.
Investigation
- Right click on job object and choose Execute Once
<Please see attached file for image>

- Check 'At Date/Time and manually enter a value
- Click OK
Results
Actual: An U00011330 error message is displayed similar to the one above since the date picker failed to set the Date/Time that was manually entered.
Expected: The Date/Time manually entered is selected in the date picker and the Job is scheduled to run at that time.