Work Anniversary Calculator
Enter your start date to see your exact years of service and your next work anniversary — with milestone years flagged automatically.
How this is calculated
The calculator takes your start date and works out full years, months and days of service as of today, using the same calendar-accurate math as the Age Calculator — just anchored to a hire date instead of a birth date. It then finds your next work anniversary (today included) and the exact number of years you'll be turning, and flags it if that year lands on a commonly recognized service milestone.
Why milestone years matter
Service milestones — typically 1, 3, 5, 10, 15, 20 and 25 years, then every 5 years after — are when most employers hand out recognition, extra PTO, or a service award, so knowing the exact date ahead of time is genuinely useful for HR teams planning recognition programs and for employees curious how close they are. Outside of milestone years, this is also just a quick way to answer "how long have I worked here?" without doing the year-month-day math by hand.
Frequently asked questions
How is years of service calculated?
Years of service counts full calendar years elapsed since your start date, the same year/month/day math used by the Age Calculator — just anchored to your hire date instead of your birth date.
What counts as a milestone work anniversary?
Most employers recognize 1, 3, 5, 10, 15, 20, 25 years of service and every 5 years after that as milestone anniversaries, often tied to service awards or extra time off. This calculator flags your next anniversary whenever it lands on one of those years.
What if my start date was February 29?
In non-leap years, your anniversary is treated as March 1 — the same convention this site's other date tools use for any leap-day date that doesn't exist that year.