Date Calculator

Use a date calculator to find the interval between two dates or add and subtract days, weeks and months from a starting date.

Days between two dates

Enter a start and end date to calculate the elapsed calendar-day difference. The result can be useful for project planning, deadlines and date-based comparisons.

Adding days and weeks

A day-based calculation moves the calendar by the selected number of days. A week is treated as seven days.

Adding months

Month arithmetic follows calendar months, so adding one month to a date near the end of a month can behave differently from adding a fixed number of days.

Inclusive versus exclusive counting

Some applications count both the start and end date while others count elapsed time between them. Always confirm which convention a deadline or contract uses.

Practical uses

Use the tool for planning events, study periods, subscriptions, project schedules and personal date calculations.

Limitations

Public holidays and business-day rules are jurisdiction-specific; a simple calendar-day result should not be presented as a business-day calculation unless those rules are explicitly included.