# 时间戳是什么？
**URL:** https://meta.discourse.org/t/what-is-the-time-stamp/118723
**Category:** Support
**Created:** [2019年五月26日 15:05 UTC](https://meta.discourse.org/t/what-is-the-time-stamp/118723 "2019-05-26T15:05:00Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@ondrej](https://meta.discourse.org/u/ondrej)
#### Post date: [2019年五月26日 15:05 UTC](https://meta.discourse.org/t/what-is-the-time-stamp/118723/1 "2019-05-26T15:05:00Z")
Hello, I don’t understand what the timestamp feature does. Also, can you un-do it?
Thanks.
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### Author:  [@Thomas\_G](https://meta.discourse.org/u/Thomas_G)
#### Post date: [2019年五月26日 15:34 UTC](https://meta.discourse.org/t/what-is-the-time-stamp/118723/2 "2019-05-26T15:34:33Z")
Changing Timestamp simply means you change the date and hour of the creation of a post or topic.
* * *
Here is how to un-do it:
> [@Undo change timestamp](https://meta.discourse.org/t/undo-change-timestamp/78966):
>
> One of our mods changed the timestamp as a way to unbump a topic and I wanted to revert that change because. I wrote a rake task that does this. It’s a small thing, but why not share? # /var/www/discourse/lib/tasks/set\_timestamp\_to\_last\_version.rake desc "Set timestamp of all posts in a topic to the post's last\_version\_at" task "set\_timestamp\_to\_last\_version", [:topic\_id] =\> :environment do |\_, args| topic\_id = args[:topic\_id] if !topic\_id puts "ERROR: Expecting rake set\_timestamp\_to\_la…
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### Author:  [@ondrej](https://meta.discourse.org/u/ondrej)
#### Post date: [2019年五月26日 15:44 UTC](https://meta.discourse.org/t/what-is-the-time-stamp/118723/3 "2019-05-26T15:44:15Z")
Thanks, all understood! I get that now thanks 😄
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### Author:  [@system](https://meta.discourse.org/u/system)
#### Post date: [2019年六月25日 15:44 UTC](https://meta.discourse.org/t/what-is-the-time-stamp/118723/4 "2019-06-25T15:44:15Z")
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