# Date systems supported in Julia

**URL:** <https://discourse.julialang.org/t/date-systems-supported-in-julia/20843>\
**Category:** New to Julia\
**Created:** [February 16, 2019, 2:43am UTC](https://discourse.julialang.org/t/date-systems-supported-in-julia/20843 "2019-02-16T02:43:40Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![MakinBugBoxes](https://avatars.discourse-cdn.com/v4/letter/m/2acd7d/32.png) [@MakinBugBoxes](https://discourse.julialang.org/u/MakinBugBoxes)\
**Post date:** [February 16, 2019, 2:43am UTC](https://discourse.julialang.org/t/date-systems-supported-in-julia/20843/1 "2019-02-16T02:43:40Z")

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I’m new to Julia. I have a task that involves lots of dates from all sorts of date systems: Hebrew, Islamic, Gregorian, Julian, Mayan, Persian, Indian Civil Calendar, French Republic Calendar with the goal of converting to a date in the Julian Day calendar format. I have been unable to find the date system used in Julia. Thus, the questions!

- What calendar system is the default in Julia?
- Are any date conversions from one of the above list to another of the above list present in Julia?  
Thanks!

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**Author:** ![crbinz](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/crbinz/32/1919_2.png) [@crbinz](https://discourse.julialang.org/u/crbinz)\
**Post date:** [February 16, 2019, 2:56am UTC](https://discourse.julialang.org/t/date-systems-supported-in-julia/20843/2 "2019-02-16T02:56:55Z")

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According to the [docs](https://docs.julialang.org/en/v1.1/stdlib/Dates/#Dates-1), julia’s `Date`s “are based on the [ISO 8601](https://en.wikipedia.org/wiki/ISO_8601) standard, which follows the proleptic Gregorian calendar.”

Also there is [`datetime2julian`](https://docs.julialang.org/en/v1.1/stdlib/Dates/#Dates.datetime2julian) (and [`julian2datetime`](https://docs.julialang.org/en/v1.1/stdlib/Dates/#Dates.julian2datetime)).

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**Author:** ![MakinBugBoxes](https://avatars.discourse-cdn.com/v4/letter/m/2acd7d/32.png) [@MakinBugBoxes](https://discourse.julialang.org/u/MakinBugBoxes)\
**Post date:** [March 4, 2019, 7:41pm UTC](https://discourse.julialang.org/t/date-systems-supported-in-julia/20843/3 "2019-03-04T19:41:54Z")

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ISO 8601 is a good calendar. Thanks! Might you know if anyone is working on a Hebrew-to-Julia’s Dates conversion tool?