Countdown Calculator
See live time remaining or elapsed.
Choose a target date and time.
What this calculator does
Create a live countdown to a local date and time in any supported time zone, with daylight-saving rules applied.
Inputs and what they mean
- Target date and time
- — datetime-local value.
- Time zone
- — choice value.
- Time format
- — 12 or 24 hour value.
How to use it
- Enter the dates, times, or schedule details.
- Adjust the available options for your situation.
- Review and copy the instant result.
Formula
Countdown = target instant − current instant, resolved through the selected IANA time zone.
Worked example
Countdown to a target
Choose a future local date and time in a time zone.
Reading the result
The headline figure is the main answer. Any breakdown underneath shows the parts that make it up, so you can check the working and see what changes when you adjust an input.
Limitations and assumptions
Results depend entirely on the figures you enter and are rounded for display. They are for general information and education, not professional advice.
Common questions
Related tools
Calculate elapsed hours and minutes between two times, including overnight.
Everyday