Date difference, add days and subtract days.
What it's for
Count the days between two dates, or find the date a number of days, weeks, months or years before or after another — for a deadline, a notice period or a due date.
Before you start
Have the dates you are working with, or the starting date and the length of time, such as "30 days" or "6 months".
Choose what to work out
Pick Days between to measure the gap between two dates, Add to a date to find a date later on, or Subtract from a date to find one earlier.
Enter the dates
For Days between, pick the two dates in From and To; it does not matter which is earlier. To add or subtract, pick the date in Starting date.
Enter the length of time
When adding or subtracting, type whole numbers in years, months, weeks and days, and leave the rest at 0. Months are added first, then the days.
Press Calculate
Press Calculate. The answer already updates as you choose; the button brings it into view. Under Calculation each step is listed.
Reading the result
If it goes wrong
Three questions: how far apart two dates are, and what date lands a given span before or after another. Alongside the total you get whole weeks, weekdays, weekend days and the day of the week the answer falls on.
Every step is integer arithmetic on the date parts — no clock, no timezone, no daylight-saving boundary that can quietly shift an answer by a day.
No. It counts Mondays to Fridays only. Philippine holidays are proclaimed annually and move — a regular holiday can be shifted to a Monday, and special non-working days are declared with little notice — so a built-in list would be wrong within the year it shipped. If you need working days net of holidays, subtract the proclaimed ones for your period.
28 February, or 29 February in a leap year. It does not roll forward to 3 March. That is how people read "one month later", and it is how contractual periods are usually counted — but check your contract, because some define a month as 30 days.
Because months have different lengths. This adds months first and then days, which matches how "one month and three days" is read. Adding the days first can land on a different date at month ends.
The day is clamped to the target month rather than spilling into the next one.
Calendar weekdays only. Philippine holidays move every year, so none are excluded here.
Important
Calendar arithmetic only. Weekday counts do not exclude holidays. Nothing you type here is sent to our servers — the calculation runs entirely in your browser.
