Date & Time Calculator

This calculator helps you with time and date calculations. It offers two modes: calculating the time duration between two dates and times, or finding a new date by adding/subtracting years, months, days, hours, minutes, or seconds.

How to Use the Calculator

1. Pick Your Mode: Use Time Difference to find the time span between dates and times, or Add/Subtract Time to add to or subtract from a date and time.
2. Time Difference: Enter your 'Start Date & Time' and 'End Date & Time', then click Calculate. The result area will instantly show you exactly how far apart these two moments are.
3. Add/Subtract Time: Enter a 'Start Date & Time', select 'Add' or 'Subtract', and input any duration—from years and days to hours and seconds. Click Calculate to find the exact future or past date and time.

Reading Your Results

What you'll see depends on which mode you are using:

• Time Difference: Get a complete breakdown of the interval — years, months, days, hours, minutes, and seconds. For quick reference, we also show the total as weeks, days, hours, minutes, and seconds.
• Add/Subtract Time: See the resulting date and time after your specified duration has been added or subtracted. We'll also tell you what day of the week it falls on.