Quick answer: count full years from the hire date, then full months, then days. Hired March 15, 2019, on September 30, 2026 is 7 years, 6 months and 15 days, about 7.55 years.
Where years of service are used
Vacation tiers, severance formulas, retirement vesting and service awards all use length of service, but each plan defines it: whether breaks in service reset the count, whether part-time years count fully, and whether the leaving date is included.
Vacation tiers often step up with service; see your accrual rate in the PTO calculator.
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Questions
How is length of service used?
Employers use it for vacation tiers, severance formulas, retirement vesting and service awards. Each plan defines its own rules for part-time service and breaks.