Days since calculator

How are the days counted?

The calculator counts calendar days between your starting date and the end date, which starts on today in your local time zone. Today is 0 days ago; yesterday is 1 day ago. The starting day is not counted unless you choose to count it.

Should I count the starting day?

It depends on what you are counting. For how long ago something happened, leave the option off: something you did yesterday was 1 day ago. To count the starting day as day 1, turn it on. Then January 1 to January 10 is 10 days instead of 9. Couples counting their days together often count this way, as do people counting the days of a trip, so the total includes both the first and the last day.

What about weeks, months and leap years?

Weeks are groups of seven days, with any days left over shown separately. Calendar months use the same day of the month where possible, or the last day of a shorter month. For example, January 31 to February 28 in a non-leap year is one calendar month. Years are groups of 12 calendar months.

Leap days are included. Changing the clocks for daylight saving does not add or remove a calendar day. This is a date calculator, so it does not measure exact hours or times of day.

How do I find the date a number of days ago?

Use the second calculator. Enter the number of days, choose before or after, and pick the date to count from. It starts on today, so 90 days before today gives the date 90 days ago. Choose after to find the date 30, 90 or 100 days from now.

What day of the year is it today?

The line at the top of this page shows today's number in the year, counting January 1 as day 1, and how many days are left. A common year has 365 days and a leap year has 366, so in a leap year every day from March 1 onwards is one number higher.

To count the days that have passed this year, pick January 1 as the starting date and leave the end date on today. Turn on counting the starting day to get the same number as the day of the year.

What can I use it for?

Check how long it has been since a haircut, a holiday, a call home or a filter change. For ideas on keeping a regular log, explore household chores and home maintenance.

Are my dates saved?

Your dates stay in this page while it is open. The calculator does not save them or send them to a server. To keep a date and its history, add it to Last Time.