Credited Service Date
Combine employment periods and manual day credits to calculate credited service, an equivalent continuous start date and the next anniversary.
Starts with an editable example. Replace the dates and rules with your own.
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Select your counting rules and calculate.
Calculation details
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How to use this calculator
Choose a reporting date, add employment periods with inclusive endpoints, and enter any explicit extra or removed day credit.
Overlapping and adjacent periods merge before counting. Dates after the report are excluded. The equivalent start ends at the report date and preserves the credited day count. Anniversary dates clamp to the end of a short month.
A worked example
January 1–31, 2026 and January 15–February 10 overlap. Together they contribute 41 calendar dates, not 58. A five-day manual credit makes 46.
Is the equivalent start date a benefits eligibility decision?
No. It is a day-count convention based on your entries. Employer rules may treat breaks, part-time service and anniversaries differently.
Which calendar and years are supported?
Use Gregorian dates from 1900 through 2100, with results in that range. Daily attendance, office, coverage and chore plans allow up to 366 dates; school cycles, course plans and milestones allow up to 731. Dependency and historical workday calculations scan at most 3,661 dates. Class-session searches allow 366 dates and 200 sessions. Time-zone tools use browser IANA rules and require a choice when local times repeat. Dates and policy rules are entered manually; no employer, retailer, school or local weather policy is inferred. Copy, CSV and printing include the calculation rules; calendar exports appear when the result contains dated events.
What happens to my dates?
Calculations run on your device. Saving a calculation is optional and keeps it in this browser. A setup link contains the dates and settings you entered; anyone with the link can read them. Use one tab per saved calculator. Clear saved data from Privacy & settings.