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Countdown Timer & Time Calculator
Count down to any date/time, run a duration timer, add/subtract time, or calculate time between two dates. Privacy-first: runs locally.
Ready
Countdown to Date/Time
Duration Timer
Time Calculator
Time Between
Label (optional)
Timezone
Local (your device)
UTC
Tip: Local uses your device clock. UTC avoids timezone confusion when sharing.
Target date
Target time
Start
Pause
Reset
Copy Result
Set a target date/time, then press Start.
Countdown
Target: —
—
Total seconds
—
Total minutes
—
Total hours
—
Total days
—
Hours
Minutes
Seconds
End alert
On
Off
Start
Pause
Reset
Copy Result
Use this for workouts, study sessions, cooking, or any timed task.
Duration
Original: —
—
Seconds remaining
—
Status
Ready
Base date
Base time
Operation
Add time
Subtract time
Timezone
Local (your device)
UTC
Days
Hours
Minutes
Seconds
Compute
Use Now
Copy Result
Add/subtract time for deadlines, ETA, schedules, and shift planning.
Calculator
Base: —
—
Result timestamp
—
ISO
—
Start date
Start time
End date
End time
Timezone
Local (your device)
UTC
Compute Difference
Start = Now
End = Now
Copy Result
Calculate time between dates for project duration, age, shifts, time logs, or travel.
Between
—
—
Total seconds
—
Total minutes
—
Total hours
—
Total days
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