# Tag quality timestamp

**URL:** <https://forum.inductiveautomation.com/t/tag-quality-timestamp/25416>\
**Category:** Ignition\
**Created:** [May 29, 2019, 8:52pm UTC](https://forum.inductiveautomation.com/t/tag-quality-timestamp/25416 "2019-05-29T20:52:30Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![dkeith](https://avatars.discourse-cdn.com/v4/letter/d/91b2a8/32.png) [@dkeith](https://forum.inductiveautomation.com/u/dkeith)\
**Post date:** [May 29, 2019, 8:52pm UTC](https://forum.inductiveautomation.com/t/tag-quality-timestamp/25416/1 "2019-05-29T20:52:30Z")

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We have a Tank overview screen that’s listing several tank properties in a table.  
There is a refresh date/time column that’s showing the value timestamp on one of the tags to display when the readings happened.  
When the tag is disabled, the timestamp is continuing to be updated when the screen refreshes. I didn’t expect that timestamp to be updated when the tag is disabled.

I tried to read the .LastChange attribute of the tag, but that is None when the tag is disabled.

Is there a way to know when a tag quality goes bad or disabled? What does the timestamp on the QualifiedValue actually represent?

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<div class="post-metadata">

**Author:** ![dkeith](https://avatars.discourse-cdn.com/v4/letter/d/91b2a8/32.png) [@dkeith](https://forum.inductiveautomation.com/u/dkeith)\
**Post date:** [May 31, 2019, 10:26pm UTC](https://forum.inductiveautomation.com/t/tag-quality-timestamp/25416/2 "2019-05-31T22:26:27Z")

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I found a useful discussion here: [tag.readAll returns different quality (vs tag.read)](http://forum.inductiveautomation.com/t/tag-readall-returns-different-quality-vs-tag-read/8501) which is many years old and says issue was fixed in 7.6 (currently running 7.9.8)

I did a comparison with readAll and read and found the timestamps are different. read gives the correct value, readAll is showing “current”

```auto
qv =system.tag.read('[default]tank/tank_018/TkTemp/value')
aqv = system.tag.readAll(['[default]tank/tank_018/TkTemp/value'])
for x in aqv:
	print x.quality, x.timestamp 
print qv.quality, qv.timestamp
```

Output is:  
Disabled Fri May 31 18:15:12 EDT 2019  
Disabled Thu Jan 10 00:53:30 EST 2019

So issue quality attribute was fixed and timestamp is still different?