When I reply a message in Thunderbird, I got a quote line similar to the following:

On 11/5/18 2:30pm, Someone wrote:

Can Thunderbird automatically add some timezone information on this line? For example,

On 11/5/18 2:30pm PST, Someone wrote:

Ideally, like in evolution, it is better to add the timezone of the replied message, but it should also be OK if the current system timezone is added. If it's the latter case, an automatic solution is preferred as I frequently travel to different timezones.


Thunderbird default date and time formats are taken from the computer's operating system.

Changing these formats is by configuring the computer's settings, although some choice is possible by Editing Thunderbird preferences.

Modifying the Date display format is done by changing the settings from the link. For readability, I reproduce these settings here as an image:

enter image description here

  • It looks like the timezone information is still not there? – xuhdev Nov 6 '18 at 1:06
  • There isn't any setting for it, and there doesn't also seem to be any extension for it. Looks like the only way is to change the system date format. – harrymc Nov 6 '18 at 7:09
  • I tried out, but it looks like this does not affect the date time used above quotes in replied messages... – xuhdev Nov 6 '18 at 17:46
  • This seems to be the only setting... You could try asking on Thunderbird Support forum, but I already searched there and all existing answers for date format point to the same information as in my answer. – harrymc Nov 6 '18 at 18:10

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