Date & Time Difference Calculator
Calculate the difference between two dates and times.
Date and time difference calculator
Find the duration between two dates for planning, project timelines, deadlines, contracts and personal events.
How it works
Frequently asked questions
Does the calculator account for leap years?
A date-duration calculation can account for calendar dates and leap years, but results involving months can depend on the chosen calendar convention.
Can I calculate hours between dates?
Yes. When date and time inputs are provided, the result can be expressed as a duration in smaller units.
Is a month always 30 days?
No. Calendar months have different lengths, so calendar-based calculations should not assume every month has 30 days.
Related GlobalConvert tools
Date & Time Difference Guide
This tool calculates the elapsed time between two dates and times. It can help with project durations, appointment intervals, work shifts, travel planning, and deadlines.
What to enter
Choose a start date and time and an end date and time. Make sure the time zone and daylight-saving assumptions are correct when the dates span locations or seasonal clock changes.
Understanding the result
The same interval can be expressed as days and hours or as a total number of hours, minutes, or seconds. For example, an interval from Monday at 09:00 to Tuesday at 09:00 is exactly 24 hours.
For business or legal deadlines, verify the governing calendar rules separately because holidays, inclusive counting, and local time conventions can change the practical deadline.