Learning how to calculate work experience in years, months and days is a small skill that comes up often, from filling in a job application to checking whether you meet a role’s minimum requirement. Employers usually ask for experience in exactly this format, so a figure like 3 years and 5 months is far more useful than a rough guess. The calculation itself is simple once you know the calendar method, because it works with real calendar months rather than dividing days by 30.
The tricky part is deciding which dates count. A start date, an end date, a gap between jobs and a notice period can all change the answer, so this guide walks through the method step by step and finishes with a worked example you can check against the Work Experience Calculator.
The Method / Formula
Work experience is simply the end date minus the start date, counted in whole calendar years, then whole calendar months, then leftover days. The start date is the first day you were on the employer’s rolls, and the end date is your last working day, or today’s date if you are still in the job. Because the count follows the calendar, a month means a real calendar month, not a fixed block of 30 days, which is why this method matches what employers expect.
The borrowing rule is what makes the subtraction work. Subtract the days first: if the end day is smaller than the start day, borrow the days of the previous month and reduce the end month by one. Then subtract the months: if the end month is smaller than the start month, borrow 12 months and reduce the end year by one. Finally, subtract the years, and what remains is your experience in years, months and days.
Two summary figures are often useful alongside that result. Total months is the years multiplied by 12 plus the remaining months, which is handy when a form asks for experience in months only. Total days is the plain calendar difference between the two dates, counting every day in between, and it is the figure a calculator shows when it counts the full span.
How to Calculate Work Experience Step by Step
- Write down the start date from your joining letter and the end date, using your last working day, or today’s date if you are still in the job.
- Subtract the days: if the end day is smaller than the start day, borrow the days in the previous month and take one off the end month.
- Subtract the months: if the end month is smaller than the start month, borrow 12 months and take one off the end year.
- Subtract the years to get the result in years, months and days.
- Work out total months as years times 12 plus the remaining months, and total days as the calendar difference between the dates, if a form asks for either.
- For more than one job, repeat the calculation for each spell and add the results together, leaving out any gaps between jobs.
Worked Example
Take the example used on the tool page: a start date of 15 January 2020 and an end date of 20 June 2023. Subtract the days first: 20 minus 15 gives 5 days, with no borrowing needed. Then subtract the months: June is month 6 and January is month 1, so 6 minus 1 gives 5 months. Finally, subtract the years: 2023 minus 2020 gives 3 years. The result is 3 years, 5 months and 5 days.
The summary figures follow from the same dates. Total months is 3 times 12 plus 5, which is 41 months, and the total calendar difference is 1,252 days. Those two figures are useful when a form asks for experience in a single unit, but the years, months and days form is the one most employers ask to see.
Common Mistakes / Good to Know
- Counting gaps between jobs as experience. Time between your last day in one job and your first day in the next is not employment, so calculate each spell separately and add only the spells.
- Dividing total days by 365 or 30 to get years and months. Calendar months have different lengths, so a division shortcut drifts from the figure an employer calculates, and the borrowing method is the reliable one.
- Using the offer date or interview date instead of the joining date. Experience runs from the day you joined the rolls, and the dates on your relieving letters are the ones a background check will confirm.
- Leaving out the notice period, or counting it twice. Time spent on the rolls during a notice period normally counts, but if the relieving letter shows a different last working day, use that date.
Frequently Asked Questions
How do I calculate work experience in years, months and days?
Subtract the start date from the end date using whole calendar units. First subtract the days, borrowing the days of the previous month if the end day is smaller; then subtract the months, borrowing 12 months if the end month is smaller; then subtract the years. The result is your experience in years, months and days.
Does my notice period count as work experience?
Normally, yes. As long as you are still on the employer’s rolls during the notice period, that time counts. The date that matters is the last working day shown on your relieving letter, so use that date as the end date if it differs from your resignation date.
Do gaps between jobs count as work experience?
No. Only time actually spent in employment counts. Calculate each job spell on its own, then add the spells together, and leave out any months spent between jobs.
How do I add up experience from more than one job?
Work out each job’s spell separately with the same borrowing method, then add the results together. Add the years, months and days, carrying 12 months into a year where needed, and leave out any gaps between jobs.
Once you can work out a spell of experience this way, try the Birth Date Calculator for date arithmetic of a different kind, and read our guide How to Calculate Age from Date of Birth Manually next for the same borrowing method applied to age.
1 thought on “How to Calculate Work Experience in Years, Months and Days”