Modified Julian Date (MJD) to date
MJD counts days from midnight on 17 November 1858; each unit is one day and the fraction is the time of day.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Enter modified julian date (mjd) and time zone (optional).
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
Date = 1858-11-17 00:00 UTC + MJD days, that is 1970-01-01 + (MJD - 40587) days. JD = MJD + 2400000.5.
Example
Inputs: Modified Julian Date (MJD) = 60,000, Time zone (optional) = UTC. Result: Date and time (UTC): 2023-02-25 00:00:00; Weekday: Saturday.
Limits and caveats
- The value is read as UTC; TT or TAI differences are not applied.
- Supported range is years 1 to 9999.
Questions about this tool
Why was MJD introduced?
To shorten the long Julian Day numbers and to start each day at midnight instead of noon.
What is the MJD at the start of 2000?
Midnight UTC on 1 January 2000 is MJD 51544.
Can I enter decimals?
Yes. The decimal part is the fraction of the day, so .25 means 06:00 UTC.