JSON Validator
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Relative Time Calculator
Work out the gap between two dates, in every unit including working days.
Quick Tool Overview
The Relative Time Calculator walks the calendar rather than dividing by an average, so one month after 31 January is 28 February — where a person would put it — instead of the off-by-a-day answer field subtraction gives.
- What it does
- Calculates the gap between two dates
- You give it
- Two dates, in either order
- You get back
- Years, months and days, plus every total
- Best for
- Deadlines, ages and elapsed time
About the Relative Time Calculator
Two dates in, and the gap between them broken down properly — years, months and days, plus every total, plus the working days between them.
Calendar arithmetic is where date libraries earn their keep, and it is easy to get subtly wrong. Subtracting the fields and dividing by 30 gives you a plausible-looking answer that is off by a day or two most of the year. This walks the calendar instead: one month after 31 January is 28 February, because that is where a person would put it, and the remaining days are counted from there. The relative wording — "3 days ago", "in 2 hours" — comes from the browser’s own formatter, so it matches what a native application would say.
Key features of the Relative Time Calculator
Real calendar arithmetic
Whole months are walked forward and clamped, so month lengths and leap years are handled rather than averaged away.
Working days
Weekends excluded, which is the figure a deadline actually depends on.
Every total as well
Total days, hours, minutes and seconds alongside the calendar breakdown, because different questions want different answers.
The "3 days ago" wording
Generated by the browser’s own formatter, so it matches what a native application would say.
Direction stated
Either order works, and the result says which way round it went.
How to use the Relative Time Calculator
-
1
Set the first date
Type it, or use the button to take the current moment.
-
2
Set the second
Either order — the calculator says which direction it went.
-
3
Read the breakdown
Years, months and days, then every total, then the working days.
-
4
Take the wording
The "3 days ago" form is generated too, for dropping into an interface.
Frequently asked questions
As long as the actual month. The calculation walks the calendar rather than dividing by an average, so one month after 31 January is 28 February and the leftover days are counted from there.
Monday to Friday, with both weekends excluded. Public holidays are not, because they differ by country and by year — subtract them yourself if they matter.
The calendar breakdown is unaffected: a day is a day whether it contained 23 hours or 25. The total-hours figure does reflect the real elapsed time, so the two can differ by an hour across a change.
Your own, unless you enter a date with an explicit offset or a Z. Everything is calculated in the browser, so nothing about your machine leaves it.
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