Years of Service Calculator: Employment Tenure
hire date → tenureCalculate years of service and employment tenure from your hire date — exact years, months, and days worked, plus your next anniversary. For HR, seniority, vesting, FMLA.
US Employment Use Cases
This years-of-service calculator is built for American workplace and HR scenarios where exact tenure matters:
- Employment tenure: exact years, months, and days between a hire date and today (or a separation date)
- HR records & seniority: document how long an employee has worked for anniversary bonuses and seniority lanes
- Vesting schedules: check 401(k) / pension vesting cliffs tied to years of service
- FMLA service test: the 12-month "months of service" requirement for FMLA leave (DOL)
- Resume & background checks: state tenure accurately on applications and verifications
How Tenure Is Counted
Service time follows standard calendar borrow-month math (like age, but measured from a hire date):
- Years: whole years from hire to end date
- Months: remaining whole months after subtracting full years
- Days: remaining days after subtracting full months
- Total days: exact calendar-day count, leap-year aware
- Anniversary: date of the next whole-year work anniversary
Common Mistakes
Common mistakes: counting calendar days and calling them "years" without the month/day breakdown, forgetting leap years in a long tenure, mixing a hire anniversary with a fiscal/contract date, and assuming the FMLA 12-month test is met without also meeting the 1,250-hour rule. This tool flags the 12-month service duration only — confirm the hours requirement separately.
Tool Algorithm & Source
The calculator applies standard date-difference math and references the federal FMLA service rule:
- Borrow-month subtraction: end minus hire, borrowing days then months for an exact Y/M/D result
- FMLA 12-month test: DOL requires 12 months of service (≈ 52 weeks / 365 days) plus 1,250 hours in the prior 12 months for eligible leave
- Not legal advice: some employers count service by an "employment anniversary" method; verify your company policy
Authoritative Source & Last Updated
FMLA service eligibility references the US Department of Labor rule; this tool only measures elapsed time.
- Source: US DOL — FMLA "12 months of service" + 1,250-hour eligibility (dol.gov/agencies/whd/fmla)
- Last updated: 2026-08-07
- Not advice: Informational only. Confirm FMLA eligibility and vesting with your employer or a qualified HR / employment professional.
Frequently Asked Questions
How do I calculate years of service from a hire date?
Enter your hire date and an optional end date (it defaults to today). The tool returns exact years, months, and days of employment plus your next work anniversary.
Does this calculator include the FMLA 12-month service rule?
It flags whether your tenure meets the 12-month "months of service" test for FMLA (about 365 days). FMLA also requires 1,250 hours worked in the prior 12 months — that hour test is not computed here and must be confirmed with your employer.
Is years of service the same as my age?
No. Age is measured from your date of birth; years of service is measured from your hire (or start) date. This calculator measures employment tenure, not age.
How is the next work anniversary calculated?
The tool adds one year to your hire date and, if that date has already passed in the measured period, steps to the following year, giving the next whole-year anniversary after the end date.
Does this account for leaves of absence?
No. The tool measures elapsed calendar time between two dates. Whether a leave pauses or breaks continuous service depends on your employer policy and applicable law — verify with HR.