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Date Difference CalculatorFast utility.

Calculate precise durations between two dates.

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Browser-first

Designed for fast, practical workflows without unnecessary friction.

Free utility

Built by Data Menu to help developers, operators and data teams move quicker.

Data-ready

Useful for formatting, cleaning, generating, converting and validating everyday data.

Interactive workspace

Paste, generate, convert or clean your data directly in the tool below.

Ready to use
Timezone

Date A

Date A Input
Pick Date
Pick Time
Local (UTC)
22/05/2026 23:54:16 Z
UTC
22/05/2026 23:54:16 Z

Date B

Date B Input
Pick Date
Pick Time
Local (UTC)
23/05/2026 00:54:16 Z
UTC
23/05/2026 00:54:16 Z
Absolute difference
Signed: +1 hour
Human
1 hour
ISO 8601 Duration
PT1H
Years (approx)
0
Months (approx)
0
Weeks
0
Days
0
Hours
1
Minutes
60
Seconds
3600
Milliseconds
3600000
Business Mode
Region
Custom holidays (YYYY-MM-DD, one per line)
Business days (inclusive)
1
Weekend days skipped
0
Holidays skipped
0
Visual timeline
2026-05-22T23:54:16.036Z2026-05-23T00:54:16.036Z
A
22/05/2026 23:54:16 Z
B
23/05/2026 00:54:16 Z
One date per line. Differences show vs A and vs previous row.
InputErrorISOLocalΔ vs AΔ vs prev
Results appear here…

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