# Universal Time vs UTC Time in Dates

**URL:** https://discourse.julialang.org/t/universal-time-vs-utc-time-in-dates/103204
**Category:** General Usage
**Tags:** dates
**Created:** [August 25, 2023, 2:18pm UTC](https://discourse.julialang.org/t/universal-time-vs-utc-time-in-dates/103204 "2023-08-25T14:18:41Z")
**Posts on this page:** 1
**Showing post:** 7

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### Author: ![mihalybaci](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mihalybaci/32/13528_2.png) [@mihalybaci](https://discourse.julialang.org/u/mihalybaci)
#### Post date: [August 25, 2023, 3:54pm UTC](https://discourse.julialang.org/t/universal-time-vs-utc-time-in-dates/103204/7 "2023-08-25T15:54:19Z")

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It would appear that the decision has already been made to end leapseconds.

> [@\`DateTime\` arithmetic on \`Microsecond\` (or smaller) scale](https://discourse.julialang.org/t/datetime-arithmetic-on-microsecond-or-smaller-scale/102949/30):
>
> @Oscar_Smith brought up an argument for why it shouldn’t error - namely, imagine using DateTime and its arithmetic as the time variable in an ODE. DateTime shouldn’t be used for time intervals (UTM though is there for that); nor then I think ODEs. DateTime is for ISO 8601 timestamps, as documented; I guess for 8601-1 (going forward, not yet documented as such I believe), as opposed to 8601-2: [https://www.isotc154.org/posts/2019-08-27-introduction-to-the-new-8601/](https://www.isotc154.org/posts/2019-08-27-introduction-to-the-new-8601/) ISO 8601 is now a family…

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