How many days until the wedding? What date is 90 days from today? This date calculator is two tools in one: find the exact days between two dates, or add and subtract days, weeks, months and years from any date — for deadlines, contracts, anniversaries and countdowns.
Days between two dates
Pick a start and end date and the calculator shows the gap in days, weeks-and-days, and years/months/days. The count is exclusive of the start day: from July 1 to July 4 is 3 days (end minus start). Worked example: January 1 to December 25 of the same year is 358 days — about 51 weeks — which is exactly the kind of number you need for savings plans, notice periods or event countdowns.
Adding or subtracting time from a date
Switch to Add/Subtract mode, choose a date, and move forwards or backwards by any amount. "What date is 90 days from March 3?" → June 1. Common uses: 30/60/90-day payment terms, probation periods, warranty windows, medication schedules and project milestones.
How months and leap years are handled
Adding a month lands on the same day-of-month where possible, rolling back when the target month is shorter — January 31 + 1 month gives February 28 (or 29 in a leap year). Leap years are handled automatically throughout, so multi-year spans stay exact.
Related date tools
Counting from a birth date specifically? The age calculator gives an exact age with totals. Need hour-and-minute precision between two timestamps — like shift lengths or travel time? Use the time duration calculator.