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Date Calculator · Days Between Dates & D-day

Count the days between two dates, find the date a number of days before or after, and calculate 100-day or 1000-day anniversaries.

📆 Days between two dates

Count the days between two dates — for working days, trip length, days remaining and more.

Start date
End date

⏩ Date after N days

Find the date a given number of days after the start date. Handy for 100-day or 1000-day anniversaries and deadlines.

Start date

⏪ Date before N days

Find the date a given number of days before the start date — such as a few days before a deadline or departure.

Start date

Days between two dates — Pick a start and end date to get the number of days, plus the span in years, months, days and weeks. Useful for working days, trip length or days remaining.

Date after or before N days — Find the date a given number of days after or before the start date, with a D-day count. Turn on “Include start date” to count the start date as day 1, as is common for anniversaries.