Time difference calculator vs “X ago”
When to use a duration between two dates, and when a simple offset from now is the right tool.
Choosing a tool
Offset from now
Use the homepage calculator when one of the two times is “now” and the other is a round number of minutes, hours, or days away. That is the “what time was it 3 hours ago” family of questions. The URL is short and reusable.
Two named times
Use the time difference calculator when both ends are known: contract start and end, flight departure and landing, or two log lines. You get total days plus leftover hours and seconds, and also totals in weeks and months using 7-day weeks and 30-day months.
Those month and year totals are convenience counts, not civil calendar months. A 31-day month will not match “1 month” in the breakdown. For legal durations, use the date difference your jurisdiction defines, not this page.
Example: start 2026-01-31 10:00, end 2026-03-03 10:00. Civil calendars call that “one month and three days” or “the rest of January plus March 1–3”, depending on the rule. This site’s 30-day month row will not match a payroll month. The total-days row will. Prefer total days when the number will be checked by someone else.
Unit conversion is a third job
“How many minutes is 3 days?” does not need a start time. That is the time unit converter. Mixing conversion with “ago” is how people accidentally double-count. Convert first if you must, then apply the offset, or skip conversion and pick the unit on the homepage.
Questions
Why do months on the difference page use 30 days?
So every visit gets a stable number. Civil months are 28–31 days. The page labels the figure as a 30-day month so you can see it is an estimate.