# Update a field (#+LAST\_MODIFIED: ) at save

**URL:** <https://org-roam.discourse.group/t/update-a-field-last-modified-at-save/321>\
**Category:** How To\
**Created:** [June 9, 2020, 4:32pm UTC](https://org-roam.discourse.group/t/update-a-field-last-modified-at-save/321 "2020-06-09T16:32:53Z")\
**Posts on this page:** 1\
**Showing post:** 28

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**Author:** ![savnk](https://avatars.discourse-cdn.com/v4/letter/s/3ec8ea/32.png) [@savnk](https://org-roam.discourse.group/u/savnk)\
**Post date:** [December 28, 2020, 11:03am UTC](https://org-roam.discourse.group/t/update-a-field-last-modified-at-save/321/28 "2020-12-28T11:03:29Z")

</div>

I was trying to use `time-stamp` and had issues as well.  
turns out the issue was `time-stamp` wasn’t searching far enough into the file.  
set `time-stamp-line-limit` to something higher than 8 (default). I set it to 18.  
also I am using last\_modified and added a space between last\_modified and time-stamp.  
the following matches

```auto
#+last_modified: [2020-12-28 Mon 02:58:51]

```

on line 9.

```auto
(add-hook 'org-mode-hook (lambda ()
                             (setq-local time-stamp-active t
                                         time-stamp-line-limit 18
                                         time-stamp-start "^#\\+last_modified: [\t]*"
                                         time-stamp-end "$"
                                         time-stamp-format "\[%Y-%m-%d %a %H:%M:%S\]")
                             (add-hook 'before-save-hook 'time-stamp nil 'local)))

```

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