Calculate continuous service duration used when checking long-service entitlements. The calculator runs entirely in your browser and pairs a focused answer with the method, assumptions and the related tools worth checking next.
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Review the inputs and select Calculate.
Enter the service start date and a reference date. The calculator measures the unbroken calendar interval between them and expresses it as completed years, months and days, with the total day count, whole weeks and approximate month and year totals alongside — the duration figure used as the starting point for long-service questions.
The tool measures a single interval from the recognised start date to the reference date: complete years by anniversaries, then complete months, then the remaining days, using real month lengths and leap years. It assumes the service runs continuously between the two dates entered.
Measured to 20 October 2026, service starting on 3 February 2014 comes to 12 years, 8 months, 17 days — 4,642 days, or 663 whole weeks. Edge case: if the reference date is entered before the start date, the same interval is reported as a positive duration, so check the order of the dates if the result looks unexpected.
This calculator measures how long the service is; it does not work out a leave entitlement, an accrual rate or a payout, and it cannot decide whether gaps or breaks count as service. Those questions depend on the law, award or contract that applies to the job, and should be checked against that source.
Enter the service start date and the tool measures the completed service span. Each step below is a short action rather than a wall of explanation.
Use the most reliable source value available for this input.
Use the most reliable source value available for this input.
Read the result, then copy, print or share a link that reopens the same inputs.
Measure the calendar interval from the recognised start date to the reference date.
Similar tools answer different questions. Match the inputs and the reference point to the answer you actually need.
The numbers come from your inputs; this shows the shape of the calculation.
Enter the recognised start date of the service — the span is measured from this date, assuming the service runs continuously.
Enter the date to measure the service to — the interval between the two dates is reported as completed years, months and days.
The completed service span with totals: service from 3 February 2014, measured to 20 October 2026, comes to 12 years, 8 months, 17 days — 4,642 days, or 663 whole weeks. It measures duration only; it does not work out entitlement, accrual or payout.
Use exact source inputs, keep the reference date visible and verify any official rule separately.
Set the reference date to the event that actually controls the decision, not to today.
Compare the stated method here against the other tool's convention before assuming an error.
For a neighbouring calculation, open the Retirement Age Calculator or the RMD Age Calculator. To understand the reasoning first, read How to Calculate Years of Service Accurately.
Choose another focused tool when the underlying question changes.
Understand the calendar rules, edge cases and next steps behind this calculator.
Entitlements hinge on continuous service — a defined term, not just calendar time. Read Long Service Milestones: Continuous Service and the Dates That Matter before you count.
Answers about method, inputs, privacy, boundaries and responsible interpretation.
It measures one unbroken calendar interval between the service start date and the reference date you enter, expressed as completed years, months and days. The total day count, whole weeks and approximate month and year totals are shown alongside.
Complete years are counted by anniversaries of the start date, then complete months, then the remaining days, using real month lengths and leap years. The calculation assumes the service runs continuously between the two dates entered.
Measured to 20 October 2026, service starting on 3 February 2014 comes to 12 years, 8 months and 17 days — 4,642 days in total, or 663 whole weeks.
No. It measures how long the service is; it does not work out a leave entitlement, an accrual rate or a payout, and it cannot decide whether gaps or breaks count as service. Those questions depend on the law, award or contract that applies to the job, and should be checked against that source.
The same interval is reported as a positive duration, so the figures can look plausible even with the dates the wrong way round. Check the order of the dates if the result looks unexpected.
Navjeet Kamboj is the author and editor of Age Calculator Lab. He focuses on making age, date, milestone and planning calculations easier to understand through clearly explained methods, practical examples and responsible limitations.