Days between two dates, working days and adding months

To count the days between two dates, subtract the earlier date from the later one on the calendar, including leap days. The result does not count the start day. If both days should count, as in many notice periods and leave applications, add one.

Counting days

The date calculator counts calendar days between the two dates. Tick “Include the end date” if both the first and the last day should count. Rules differ:

• Notice periods and leave: often count both days. Check your letter or policy.
• Interest: banks usually count the days the money was held. For a day-based interest sum, see the simple interest formula.
• Exam age limits: use age “as on” the date in the notice; see age in years, months and days.

Working days

Choose a 5-day week (Saturday and Sunday off) or a 6-day week (Sunday off). The count skips weekends only. Public holidays differ by state and employer, so subtract them yourself.

Adding days, weeks, months or years

• Days and weeks are simple calendar steps.
• Months keep the same day of the month where it exists. If it does not (31 January + 1 month), the last day of the month is used: 28 February, or 29 in a leap year.
• Years work the same way: 29 February + 1 year is 28 February.

How to use the date calculator

1. To count days, pick the two dates and tick “Include the end date” if needed.
2. Choose a 5- or 6-day week for working days.
3. To find a future or past date, pick a start date and add or subtract days, weeks, months or years.

For tax deadlines you want a reminder for, see GSTR-3B deadline reminders.