Restrict Time record submission on specific days.

[Indra-kolge]

PR Description:

Ensure that time entries (represented by the work_date field) are not submitted after 8:00 PM CST on two key dates:
The 16th of the month and The last day of the month
If a user tries to submit time for a current or past date after the cut-off time, the submission is blocked and a clear error message is displayed.

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[ravichandra1998g]

Can you please modify the title of this PR and add a clear description.

[Indra-kolge]

Hi @ravichandra1998g ,
I've updated PR name and description.

[ravichandra1998g]

looks good to me, Thank you!