I'm not 100% sure I understand how you want Thunar to show dates.
A: All dates to be shown in your preferred format
or
B: Recent files to show "Today" and older files in your preferred format, with the option to show the date for "Today" files.
If A then, as CharlesV said, just choose the Custom option instead of Today/Custom and edit the format to your liking.
If B you could try this
edit > configure custom actions > click on the + button to create a new action
On the Basic Tab
- Enter "Show Date" in the Name section
- Paste this into the Command section
Code: Select all
IFS=_;yad --text="%n\n$(bash -c "date -r %f")" --undecorated --class=showdate --center --button=close
- Select all file types
Click OK and then close
When you now right click on a file the option "Show Date" should appear in the pop-up menu.
Select Show Date and a small window will show the date and time the file was last modified.