How is time-in-service calculated and verified for promotions and HYT determinations?

• A. Time-in-service is counted from enlistment date and adjusted for breaks; verified in the personnel system and through payroll.
• B. Time-in-service is counted from current duty station.
• C. Time-in-service is counted from birth date.
• D. Time-in-service is determined by command policy; verified by HR only.

Answer: (A)

Time-in-service for promotions and HYT determinations is calculated from the enlistment date and adjusted for any authorized breaks in service. Start counting when you enlist, and subtract periods when you were not in creditable active service so that only actual service time is counted. This pacing keeps the measure tied to your official service record rather than where you are stationed or other factors.

Verification happens in two trusted places: the official personnel system, which holds the enlistment date and entire service history, and the payroll system, which confirms paid periods and any gaps. Having both records match ensures promotions and HYT are based on accurate TIS, and any discrepancies can be resolved with the correct adjustments.