Date Calculator
Calculate days between dates or add/subtract days
Days
0
Enter dates and press Calculate
What is the date calculator?
Two tools in one: count the days between two dates, or add and subtract days from a date.
How to use the date calculator
For days-between, pick a start date and an end date; the result shows both the total day count and a weeks-and-days breakdown. For add/subtract, pick a date, choose Add or Subtract, type the number of days, and the new date appears.
Common questions
- Does it count both ends or just one?
- The days-between count is exclusive on the start date and inclusive on the end date, which matches what most people mean by "how many days from X to Y". From the 1st to the 10th gives 9 days.
- What about leap years?
- Handled automatically. A range that crosses February 29 in a leap year counts that day.
- Are weekends excluded?
- No, the count is calendar days. If you need business days only, count calendar days then subtract two for each weekend in the range.
Tips
For "how many days until X" questions, leave the start date as today (the default) and only set the end date. For "what date is 90 days from now", use add/subtract with today as the base. The weeks-and-days breakdown helps for medical or gestational counts where 12 weeks 3 days reads more naturally than 87 days.