📅 Date Calculator
Find out exactly how much time falls between two dates, in days, weeks, months, and years.
What this calculator does
The Date Calculator finds the exact span of time between two calendar dates. Enter a start date and an end date and it returns the total number of days between them, along with an easier-to-read breakdown into years, months, and days, and into weeks and days.
How the calculation works
The calculator converts both dates into a standard calendar timestamp and subtracts them to get the raw number of days, correctly accounting for different month lengths and leap years. It then works out a calendar-style breakdown by counting whole years, then whole months, then the remaining days, similar to how you would count age or a duration by hand.
If the end date entered is earlier than the start date, the calculator automatically swaps them and lets you know, so the result is always a positive span of time. This tool is intended for general planning and educational use, such as counting down to an event or measuring a project timeline.