Workflow guide

Calculate deadlines: calendar days, business days or exact dates

The right calculator depends on how a deadline is defined, and which holidays or weekends count.

Calendar or business days?

Use date duration when every day counts. Use business days when weekends or a specified holiday calendar must be excluded. Confirm whether the first and last dates count.

Find the actual due date

For a deadline expressed as a number of days from a start date, use the add/subtract calculator. For a workday deadline, use the appropriate business-day calculation and verify the calendar.

Time zones

For a deadline tied to a local time, convert on the exact date. Daylight saving changes mean a fixed difference between two cities is not always correct.

Compare the options

Reported core features and processing methods; not independently benchmarked.
Tool	Best for	Cost / account	Processing
Count days between dates	Calculate the interval between two calendar dates.	free tier · No signup reported	Processing unverified
Count business days	Count working days between dates while accounting for weekends and holidays.	free tier · No signup reported	Processing unverified
Add or subtract calendar dates	Find a date a chosen number of days, months or years away.	free tier · No signup reported	Processing unverified
Convert time zones	Compare a date and time across multiple cities or time zones.	free tier · No signup reported	Processing unverified
Calculate age between dates	Find age or elapsed calendar time between two dates.	free · No signup reported	Processing unverified