# Dates: picosecond, femtosecond, attosecond period

**URL:** <https://discourse.julialang.org/t/dates-picosecond-femtosecond-attosecond-period/35066>\
**Category:** Internals & Design\
**Tags:** proposal, dates\
**Created:** [February 24, 2020, 10:32am UTC](https://discourse.julialang.org/t/dates-picosecond-femtosecond-attosecond-period/35066 "2020-02-24T10:32:18Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![larschrj](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/larschrj/32/13014_2.png) [@larschrj](https://discourse.julialang.org/u/larschrj)\
**Post date:** [February 24, 2020, 10:32am UTC](https://discourse.julialang.org/t/dates-picosecond-femtosecond-attosecond-period/35066/1 "2020-02-24T10:32:19Z")

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Is there any argument against adding picosecond, femtosecond, attosecond periods to Dates? (e.g. performance or bloating stdlib code)

Otherwise I’d like to do so.

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**Author:** ![yakir12](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/yakir12/32/297_2.png) [@yakir12](https://discourse.julialang.org/u/yakir12)\
**Post date:** [February 24, 2020, 10:38am UTC](https://discourse.julialang.org/t/dates-picosecond-femtosecond-attosecond-period/35066/2 "2020-02-24T10:38:10Z")

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Check out [GitHub - JeffreySarnoff/TimesDates.jl: Nanosecond resolution for Time and Date, TimeZones](https://github.com/JeffreySarnoff/TimesDates.jl)  
That would be a good place to have those units.

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**Author:** ![larschrj](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/larschrj/32/13014_2.png) [@larschrj](https://discourse.julialang.org/u/larschrj)\
**Post date:** [February 24, 2020, 10:39am UTC](https://discourse.julialang.org/t/dates-picosecond-femtosecond-attosecond-period/35066/3 "2020-02-24T10:39:08Z")

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I will check that out. Thanks.