# Elapsing a timer for a change in the UDT tag value

**URL:** <https://forum.inductiveautomation.com/t/elapsing-a-timer-for-a-change-in-the-udt-tag-value/62767>\
**Category:** Ignition\
**Created:** [August 8, 2022, 11:27am UTC](https://forum.inductiveautomation.com/t/elapsing-a-timer-for-a-change-in-the-udt-tag-value/62767 "2022-08-08T11:27:58Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Dharani\_T](https://avatars.discourse-cdn.com/v4/letter/d/bc8723/32.png) [@Dharani\_T](https://forum.inductiveautomation.com/u/Dharani_T)\
**Post date:** [August 8, 2022, 11:27am UTC](https://forum.inductiveautomation.com/t/elapsing-a-timer-for-a-change-in-the-udt-tag-value/62767/1 "2022-08-08T11:27:58Z")

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Hi ,

I would like to have timer tag in UDT whenever the value of a UDT tag changes as 1. And resets whenever the tag changes to 0.  
Literally I need the timestamp of udt tag whenever value changes which is very much possible in the normal tag.

Thanks in advance

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<div class="post-metadata">

**Author:** ![plo](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/plo/32/33875_2.png) [@plo](https://forum.inductiveautomation.com/u/plo)\
**Post date:** [August 17, 2022, 11:45pm UTC](https://forum.inductiveautomation.com/t/elapsing-a-timer-for-a-change-in-the-udt-tag-value/62767/2 "2022-08-17T23:45:39Z")

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Hello Dharani\_T!  
Can you clarify on what you were trying to achieve? or provide more details to your set up?

From what I can understand, you can configure a sibling expression tag on the UDT to display the timestamp when your 2nd tag changes from 0 to 1. Does that work for you?  
The expression tag can do a tag binding to which you point to the 2nd tag’s timestamp. The binding would look similar to this: `{[~]aClock/count.Timestamp}` where` [~]aClock/count` is the sibling tag