Count the days between two dates, or add and subtract days from any date. Results update as you type.
How many days and weeks are between two dates?
Pick a date, choose a direction, and enter the number of days.
A date calculator helps you answer two common questions: how many days are between two dates, and what date falls a certain number of days before or after a given day. Whether you are counting down to a deadline, tracking a project timeline, planning a trip, or checking how long until a birthday, the math is quick but easy to get wrong by hand. This tool counts real calendar days, accounts for leap years, and shows the difference in days as well as in whole weeks plus remaining days. The add and subtract module lets you jump forward or backward by any number of days and see the exact weekday of the result. Everything updates instantly as you type, with no calculate button. The calculator runs 100% client-side in your browser — your dates are never uploaded, transmitted, or stored on any server.
Enter a start date and an end date. The calculator counts the calendar days between them, ignoring the time of day. The result is shown in days and also broken down into whole weeks plus remaining days.
Yes. The calculator uses real calendar dates, so February 29 is counted in leap years and the total number of days stays accurate for any range.
Yes. Use the Subtract option to count backwards, or simply set an end date earlier than the start date. The difference is shown as an absolute number of days with a note about the direction.
There is no calculate button. Every change to a date or number recalculates instantly in your browser, so you can compare scenarios quickly without extra clicks.
Yes. The calculator runs 100% in your browser. Your dates and numbers are never uploaded, transmitted, or stored on any server.