# Milliseconds in dateArithmetic

**URL:** <https://forum.inductiveautomation.com/t/milliseconds-in-datearithmetic/7200>\
**Category:** Ignition\
**Created:** [September 5, 2013, 5:32pm UTC](https://forum.inductiveautomation.com/t/milliseconds-in-datearithmetic/7200 "2013-09-05T17:32:33Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Powerplan](https://avatars.discourse-cdn.com/v4/letter/p/aca169/32.png) [@Powerplan](https://forum.inductiveautomation.com/u/Powerplan)\
**Post date:** [September 5, 2013, 5:32pm UTC](https://forum.inductiveautomation.com/t/milliseconds-in-datearithmetic/7200/1 "2013-09-05T17:32:33Z")

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Hi

I’d quite like to and and subtract milliseconds from a Date datatype, dateArithmetic seems only to go to seconds

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<div class="post-metadata">

**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [September 5, 2013, 5:41pm UTC](https://forum.inductiveautomation.com/t/milliseconds-in-datearithmetic/7200/2 "2013-09-05T17:41:02Z")

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The documentation is a little out of date apparently. Try ‘ms’ for milliseconds.

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<div class="post-metadata">

**Author:** ![Powerplan](https://avatars.discourse-cdn.com/v4/letter/p/aca169/32.png) [@Powerplan](https://forum.inductiveautomation.com/u/Powerplan)\
**Post date:** [September 5, 2013, 7:24pm UTC](https://forum.inductiveautomation.com/t/milliseconds-in-datearithmetic/7200/3 "2013-09-05T19:24:00Z")

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Great

I did try “miliseconds” but I’ll try “ms” in the morning.

Chris

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<div class="post-metadata">

**Author:** ![Powerplan](https://avatars.discourse-cdn.com/v4/letter/p/aca169/32.png) [@Powerplan](https://forum.inductiveautomation.com/u/Powerplan)\
**Post date:** [September 6, 2013, 7:15am UTC](https://forum.inductiveautomation.com/t/milliseconds-in-datearithmetic/7200/4 "2013-09-06T07:15:00Z")

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Hi

```auto
dateArithmetic({Root Container.Popup Calendar.date}, 10, "ms")
```

Throws up an error

“Error in ‘dateArithmetic’ function. Date unit: ‘m’ unknown.”

Ignition v7.6.2-rc4

However

```auto
dateArithmetic({Root Container.Popup Calendar.date}, 10, "mss")
```

Seems to function

Chris