Dates and time
Measure the time between two dates.
See calendar years, months, days, total elapsed days, complete weeks, and weekdays with the counting method explained.
Your result
The difference will appear here.
Enter a start and end date to compare them.
Calendar difference
The dates were entered in reverse order, so the absolute difference is shown.
Calendar days
Weeks and days
Weekdays
Weekdays exclude Saturdays and Sundays but do not subtract public holidays.
Why date answers can differ by one day
Elapsed time normally excludes the start date. From September 20 to September 21 is one elapsed day. Selecting the endpoint option counts both dates and makes that calendar count two days.
Calendar years and months are counted first because months have different lengths. Total days use date-only values, so daylight-saving changes do not add or remove an hour from the calculation.
For deadlines, contracts, court filings, travel, or benefits, use the counting rule specified by the responsible organization.
Elapsed days versus calendar days
“How many days apart?” can mean elapsed days between midnight dates or a count that includes both the start and end date. Select the endpoint option when your instructions require an inclusive count.
Weekdays are not business days
This tool removes Saturdays and Sundays only. It does not know local holidays, closures, observed holidays, or organization-specific working schedules.
Use the governing rule
Contracts, court deadlines, leases, school calendars, benefits, and travel systems may define their own counting rules. Confirm the official rule when one day matters.
Keep calculating
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