24 hour time in Thunderbird -

[Bob Goodwin]

How to configure 24 hour time, instead of AM/PM, in Thunderbird 62.2.0 
nd/or 62.2.2.

Presently I have created /usr/bin/thunderbird24h:

/usr/bin/thunderbird24h:
#!/bin/sh
LC_TIME=C
export LC_TIME
/usr/bin/thunderbird

and rebooted but the AM/PM time is still being used. Have I nissed 
something or has something changed since Fedora-20?

[Samuel Sieb]

On 11/15/19 7:27 AM, Bob Goodwin wrote:
> How to configure 24 hour time, instead of AM/PM, in Thunderbird 62.2.0 
> nd/or 62.2.2.
>
> Presently I have created /usr/bin/thunderbird24h:
>
> /usr/bin/thunderbird24h:
> #!/bin/sh
> LC_TIME=C
> export LC_TIME
> /usr/bin/thunderbird
>
> and rebooted but the AM/PM time is still being used. Have I nissed 
> something or has something changed since Fedora-20?

I remember a thread about this a while back and I don't think there was 
any solution found.  I even tried building my own locale file and that 
didn't seem to work.

[Bob Goodwin]

On 11/15/19 3:07 PM, Samuel Sieb wrote:
> I remember a thread about this a while back and I don't think there 
> was any solution found.  I even tried building my own locale file and 
> that didn't seem to work.
> __

.

Yes that was probably me, I feel like I've been through this several 
times before, the versions change but the problem persists ... I guess I 
will just have to stick with Fedora-29 if I really want stuff to work, 
to my satisfaction, painlessly.

I keep hoping it will get better with time.

Thanks for responding,

Bob

[Tim]

On Fri, 2019-11-15 at 10:27 -0500, Bob Goodwin wrote:
> How to configure 24 hour time, instead of AM/PM, in Thunderbird
> 62.2.0 nd/or 62.2.2.

I found this advice on https://support.mozilla.org/en-US/questions/1228724

An option under "Tools > Options, Advanced, General" now allows to
select whether date/time display will follow the application locale
(adjusted by operating system's format settings for that locale) or the
locale selected in the operating system's regional settings. In other
words, an US English Thunderbird can use, for example, German formats.

https://www.reddit.com/r/Thunderbird/comments/d9jrqa/how_to_get_24hour_timec...

I had LANG and LC_ALL set to a language where time is 24h format, but I
switched to english because I don't want messages in that language. I
was faced with a 12h-time format everywhere. If I remember correctly,
unset LC_ALL in .bashrc helped here.

&

Changed desktop launcher's command string from
/opt/thunderbird/thunderbird
to
env LC_TIME=en_DK.utf8 /opt/thunderbird/thunderbird
relaunch Thunderbird, and it seems to have worked.

Are any of them any help?

[Bob Goodwin]

On 11/16/19 5:47 AM, Tim via users wrote:
> On Fri, 2019-11-15 at 10:27 -0500, Bob Goodwin wrote:
> > How to configure 24 hour time, instead of AM/PM, in Thunderbird
> > 62.2.0 nd/or 62.2.2.
>
> I found this advice on https://support.mozilla.org/en-US/questions/1228724
>
> An option under "Tools > Options, Advanced, General" now allows to
> select whether date/time display will follow the application locale
> (adjusted by operating system's format settings for that locale) or the
> locale selected in the operating system's regional settings. In other
> words, an US English Thunderbird can use, for example, German formats.

.

It appears Thunderbird 68.2.2 does not have "Tools > Options." I don't 
see Options anywhere? So I will work my way through the remaining 
suggestions ...

24 hour time seems like sucb a basic need, always wondered why it 
wasn''t included as an option from the beginning with the earliest 
computers? There must be some insurmountable difficulty in adding that 
as an option.

There has been a Config Date and time AddOn that added a GMT offset 
number to a displayed sender's time which I always looked at when 
reading messages. That seems unavailable now, my Fedora-29 system still 
has all this stuff. Anyway I find 24 hour time less confusing than the 
AM/PM format.

Thanks for the help,  Bob

.
> https://www.reddit.com/r/Thunderbird/comments/d9jrqa/how_to_get_24hour_timec...
>
> I had LANG and LC_ALL set to a language where time is 24h format, but I
> switched to english because I don't want messages in that language. I
> was faced with a 12h-time format everywhere. If I remember correctly,
> unset LC_ALL in .bashrc helped here.Changed desktop launcher's command string from
> /opt/thunderbird/thunderbird
> to
> env LC_TIME=en_DK.utf8 /opt/thunderbird/thunderbird
> relaunch Thunderbird, and it seems to have worked.
>
> Are any of them any help?

[Ed Greshko]

On 11/16/19 7:31 PM, Bob Goodwin wrote:
> On 11/16/19 5:47 AM, Tim via users wrote:
> > On Fri, 2019-11-15 at 10:27 -0500, Bob Goodwin wrote:
> > > How to configure 24 hour time, instead of AM/PM, in Thunderbird
> > > 62.2.0 nd/or 62.2.2.
> >
> > I found this advice on https://support.mozilla.org/en-US/questions/1228724
> >
> > An option under "Tools > Options, Advanced, General" now allows to
> > select whether date/time display will follow the application locale
> > (adjusted by operating system's format settings for that locale) or the
> > locale selected in the operating system's regional settings. In other
> > words, an US English Thunderbird can use, for example, German formats.
>
> .
>
> It appears Thunderbird 68.2.2 does not have "Tools > Options." I don't see Options anywhere? So I will work my way through the remaining suggestions ...

It has moved to "Edit--->Preferences--->Advanced"
> 24 hour time seems like sucb a basic need, always wondered why it wasn''t included as an option from the beginning with the earliest computers? There must be some insurmountable difficulty in adding that as an option.

Most folks in the US don't know how to deal with 24hr time.
> There has been a Config Date and time AddOn that added a GMT offset number to a displayed sender's time which I always looked at when reading messages. That seems unavailable now, my Fedora-29 system still has all this stuff. Anyway I find 24 hour time less confusing than the AM/PM format.

[Bob Goodwin]

Le 16/11/2019 à 07:13, Ed Greshko a écrit :
> It has moved to "Edit--->Preferences--->Advanced"

.

Well that works, but to my surprise English UK seems to still use AM/PM 
12 hours? French does 24 hour time however I don't know if it will let 
me use an Englsh spell checker, it seems it should ?

If they can have all those language options why notan English 34 hourrs? 
/get frustrated with Thunderbird but it's the only one I've tried that 
does most of what I want, however that advantage seems to shrink wuth 
each "improvemed" version they produce./

[Bob Goodwin]

On 11/16/19 9:22 AM, Bob Goodwin wrote:
> Le 16/11/2019 à 07:13, Ed Greshko a écrit :
> > It has moved to "Edit--->Preferences--->Advanced"
>
> .
>
> Well that works, but to my surprise English UK seems to still use 
> AM/PM 12 hours? French does 24 hour time however I don't know if it 
> will let me use an Englsh spell checker, it seems it should ?
>
> If they can have all those language options why notan English 34 
> hourrs? /get frustrated with Thunderbird but it's the only one I've 
> tried that does most of what I want, however that advantage seems to 
> shrink wuth each "improvemed" version they produce./

,

Well that's another failed attempt at fixing my problem, I am not 
comfortable in French although it does work for me, it changes the theme 
in places to a blavk on white display that I need a magnifier to read? I 
also need an English spell checker running, /am a lousy typist/. I'll 
just deal with the stupid AM/PM time display for today.

-
Bob Goodwin - Zuni, Virginia, USA

[Stephen Perkins]

< Well that's another failed attempt at fixing my problem, I am not
comfortable in French although it does work for me, it changes the theme in
places to a blavk on white

<  display that I need a magnifier to read? I also need an English spell
checker running,  *am a lousy typist*. I'll just deal with the stupid AM/PM
time display for today.

-
< Bob Goodwin - Zuni, Virginia, USA

A simple solution that worked for me with Thunderbird 68.1.1 on Fedora 30
(X86_64):

to ~/.bashrc add the line

export LC_TIME="C"

log out and back in and Thunderbird shows 24-hour format.

HTH

Stephen

On Sat, 16 Nov 2019 at 10:05, Bob Goodwin  wrote:
> On 11/16/19 9:22 AM, Bob Goodwin wrote:
>
> Le 16/11/2019 à 07:13, Ed Greshko a écrit :
>
> It has moved to "Edit--->Preferences--->Advanced"
>
> .
>
> Well that works, but to my surprise English UK seems to still use AM/PM 12
> hours? French does 24 hour time however I don't know if it will let me use
> an Englsh spell checker, it seems it should ?
>
> If they can have all those language options why notan English 34 hourrs?
> /get frustrated with Thunderbird but it's the only one I've tried that does
> most of what I want, however that advantage seems to shrink wuth each
> "improvemed" version they produce./
>
> ,
>
> Well that's another failed attempt at fixing my problem, I am not
> comfortable in French although it does work for me, it changes the theme in
> places to a blavk on white display that I need a magnifier to read? I also
> need an English spell checker running,  *am a lousy typist*. I'll just
> deal with the stupid AM/PM time display for today.
>
> Bob Goodwin - Zuni, Virginia, USA
> _______________________________________________
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[Joe Zeff]

On 11/16/2019 04:31 AM, Bob Goodwin wrote:
> It appears Thunderbird 68.2.2 does not have "Tools > Options." I don't 
> see Options anywhere? So I will work my way through the remaining 
> suggestions ...

You know, Mozilla maintains a help forum for Thunderbird.  You might 
find it best to ask there.

EXTERNAL: Re: 24 hour time in Thunderbird -

[Wells, Roger K.]

On 11/16/19 11:27 AM, Stephen Perkins wrote:

< Well that's another failed attempt at fixing my problem, I am not comfortable in French although it does work for me, it changes the theme in places to a blavk on white

<  display that I need a magnifier to read? I also need an English spell checker running,  am a lousy typist. I'll just deal with the stupid AM/PM time display for today.

-
< Bob Goodwin - Zuni, Virginia, USA

A simple solution that worked for me with Thunderbird 68.1.1 on Fedora 30 (X86_64):

to ~/.bashrc add the line

export LC_TIME="C"

log out and back in and Thunderbird shows 24-hour format.

that worked here, just had to set time formatting back to regional in preferences

HTH

Stephen

On Sat, 16 Nov 2019 at 10:05, Bob Goodwin <[e-mail]> wrote:

On 11/16/19 9:22 AM, Bob Goodwin wrote:

Le 16/11/2019 à 07:13, Ed Greshko a écrit :
It has moved to "Edit--->Preferences--->Advanced"

.

Well that works, but to my surprise English UK seems to still use AM/PM 12 hours? French does 24 hour time however I don't know if it will let me use an Englsh spell checker, it seems it should ?

If they can have all those language options why notan English 34 hourrs? /get frustrated with Thunderbird but it's the only one I've tried that does most of what I want, however that advantage seems to shrink wuth each "improvemed" version they produce./

,

Well that's another failed attempt at fixing my problem, I am not comfortable in French although it does work for me, it changes the theme in places to a blavk on white display that I need a magnifier to read? I also need an English spell checker running,  am a lousy typist. I'll just deal with the stupid AM/PM time display for today.

-
Bob Goodwin - Zuni, Virginia, USA

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--
------------------------------------------------------------------------------------------------
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RuralTechnologies.net                  Linux since Red Hat 5.1, 1998
Open-source Collaboration            Fedora since 2003

“With credulity come propaganda and advertising to dupe the citizen
with political jobbery and compromises, and the lie reaches proportions
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[e-mail]

[Bob Goodwin]

On 2019-11-16 11:25, Stephen Perkins wrote:
> A simple solution that worked for me with Thunderbird 68.1.1 on Fedora 
> 30 (X86_64):
>
> to ~/.bashrc add the line
>
> export LC_TIME="C"
>
> log out and back in and Thunderbird shows 24-hour format.
>
> HTH
>
> Stephen

.

Yes that works! I had to reset time back to the regional setting in 
Thunderbird preferences and I rebooted the system rather than just 
logging out and in, since I had tried several times earlier, although 
re-logging might have worked.

The important thing is I now get 24 hour time for messages.

Thanks for the suggestion,  Bob

.
Yes that works!

[Bob Goodwin]

On 2019-11-16 13:01, Joe Zeff wrote:
> You know, Mozilla maintains a help forum for Thunderbird.  You might 
> find it best to ask there.
> _______________________________________________
>

You are probably right. I generaly don't bother with forums since they 
often seem like the blind misleading the blind ...

It's is working now so I can stop.

[Tim]

On Sat, 2019-11-16 at 06:31 -0500, Bob Goodwin wrote:
> 24 hour time seems like sucb a basic need, always wondered why it 
> wasn''t included as an option from the beginning with the earliest 
> computers? There must be some insurmountable difficulty in adding
> that as an option.

Going from what I can see, it just seems to be some pigheadedness that
they want it to follow the system locale settings, perhaps as a
justification for removing yet another user configuration option. 
Ignoring the fact that some people have different requirements for
certain applications than their system settings.

[Stephen Morris]

On 17/11/19 01:22, Bob Goodwin wrote:
> Le 16/11/2019 à 07:13, Ed Greshko a écrit :
> > It has moved to "Edit--->Preferences--->Advanced"
>
> .
>
> Well that works, but to my surprise English UK seems to still use 
> AM/PM 12 hours? French does 24 hour time however I don't know if it 
> will let me use an Englsh spell checker, it seems it should ?
>
> If they can have all those language options why notan English 34 
> hourrs? /get frustrated with Thunderbird but it's the only one I've 
> tried that does most of what I want, however that advantage seems to 
> shrink wuth each "improvemed" version they produce./

For me it didn't work. I have Thunderbird set to the Regional locale of 
Australia and the gnome preferences are set to 24 hour time, but 
Thunderbird still displayed the dates long format with 12 hour time. To 
get Thunderbird to show 24 hour time I had to de-activate "Automatic 
Date and Time" in the gnome preferences, which caused Thunderbird to 
display times in 24 hour format but it displayed dates in short format 
even though the date preferences in gnome were set to long format. In 
order to get the date format in Thunderbird I wanted, I had to install 
the addon "Configdate" which provides access to a hidden configuration 
setting in Thunderbird. With this addon I could set the data format on 
"today's mail" to time only, this weeks mail to long format and 
everything else to short format. In all of these options the time is 
displayed in the system option of 24 hours.

regards,
Steve
> users mailing list -- [e-mail]
> To unsubscribe send an email to [e-mail]
> Fedora Code of Conduct: 
> https://docs.fedoraproject.org/en-US/project/code-of-conduct/
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[Stephen Morris]

On 18/11/19 12:17, Stephen Morris wrote:
> On 17/11/19 01:22, Bob Goodwin wrote:
> > Le 16/11/2019 à 07:13, Ed Greshko a écrit :
> > > It has moved to "Edit--->Preferences--->Advanced"
> >
> > .
> >
> > Well that works, but to my surprise English UK seems to still use 
> > AM/PM 12 hours? French does 24 hour time however I don't know if it 
> > will let me use an Englsh spell checker, it seems it should ?
> >
> > If they can have all those language options why notan English 34 
> > hourrs? /get frustrated with Thunderbird but it's the only one I've 
> > tried that does most of what I want, however that advantage seems to 
> > shrink wuth each "improvemed" version they produce./
>
> For me it didn't work. I have Thunderbird set to the Regional locale 
> of Australia and the gnome preferences are set to 24 hour time, but 
> Thunderbird still displayed the dates long format with 12 hour time. 
> To get Thunderbird to show 24 hour time I had to de-activate 
> "Automatic Date and Time" in the gnome preferences, which caused 
> Thunderbird to display times in 24 hour format but it displayed dates 
> in short format even though the date preferences in gnome were set to 
> long format. In order to get the date format in Thunderbird I wanted, 
> I had to install the addon "Configdate" which provides access to a 
> hidden configuration setting in Thunderbird. With this addon I could 
> set the data format on "today's mail" to time only, this weeks mail to 
> long format and everything else to short format. In all of these 
> options the time is displayed in the system option of 24 hours.

On thing I forgot to mention in my previous thread was this is on F30 
with Thunderbird 72.0a1.

regards,
Steve
> regards,
> Steve
> > users mailing list -- [e-mail]
> > To unsubscribe send an email to [e-mail]
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>
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[Stephen Morris]

On 18/11/19 12:34, Stephen Morris wrote:
> On 18/11/19 12:17, Stephen Morris wrote:
> > On 17/11/19 01:22, Bob Goodwin wrote:
> > > Le 16/11/2019 à 07:13, Ed Greshko a écrit :
> > > > It has moved to "Edit--->Preferences--->Advanced"
> > >
> > > .
> > >
> > > Well that works, but to my surprise English UK seems to still use 
> > > AM/PM 12 hours? French does 24 hour time however I don't know if it 
> > > will let me use an Englsh spell checker, it seems it should ?
> > >
> > > If they can have all those language options why notan English 34 
> > > hourrs? /get frustrated with Thunderbird but it's the only one I've 
> > > tried that does most of what I want, however that advantage seems to 
> > > shrink wuth each "improvemed" version they produce./
> >
> > For me it didn't work. I have Thunderbird set to the Regional locale 
> > of Australia and the gnome preferences are set to 24 hour time, but 
> > Thunderbird still displayed the dates long format with 12 hour time. 
> > To get Thunderbird to show 24 hour time I had to de-activate 
> > "Automatic Date and Time" in the gnome preferences, which caused 
> > Thunderbird to display times in 24 hour format but it displayed dates 
> > in short format even though the date preferences in gnome were set to 
> > long format. In order to get the date format in Thunderbird I wanted, 
> > I had to install the addon "Configdate" which provides access to a 
> > hidden configuration setting in Thunderbird. With this addon I could 
> > set the data format on "today's mail" to time only, this weeks mail 
> > to long format and everything else to short format. In all of these 
> > options the time is displayed in the system option of 24 hours.
>
> On thing I forgot to mention in my previous thread was this is on F30 
> with Thunderbird 72.0a1.

The other thing that may be useful or may not is, Thunderbird is 
installed in /opt/thunderbird which is still owned by root, but I have 
set the acl on the thunderbird directory to give my userid rwx access to 
everything within that directory via setfacl.

regards,
Steve
> regards,
> Steve
> > regards,
> > Steve
> > > users mailing list -- [e-mail]
> > > To unsubscribe send an email to [e-mail]
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> >
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>
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[Bob Goodwin]

.

I did this the other day and it worked initially but quit and the list 
of messages is in 12 hour time again.

A simple solution that worked for me with Thunderbird 68.1.1 on Fedora 
30 (X86_64):

to ~/.bashrc add the line

export LC_TIME="C"

Below is a copy of .bashrc with added line at the bottom:

[root@Workstation-1 bobg]# cat  ~/.bashrc
# .bashrc

# User specific aliases and functions

alias rm='rm -i'
alias cp='cp -i'
alias mv='mv -i'

# Source global definitions
if [ -f /etc/bashrc ]; then
     . /etc/bashrc
fi

What have I done wrong? I just made the same change on a second Fedora 
31 computer and it shows 24 hour time ...

[Stephen Morris]

On 22/11/19 08:12, Bob Goodwin wrote:
> .
>
> I did this the other day and it worked initially but quit and the list 
> of messages is in 12 hour time again.
>
> A simple solution that worked for me with Thunderbird 68.1.1 on Fedora 
> 30 (X86_64):
>
> to ~/.bashrc add the line
>
> export LC_TIME="C"
>
> Below is a copy of .bashrc with added line at the bottom:
>
> [root@Workstation-1 bobg]# cat  ~/.bashrc
> # .bashrc
>
> # User specific aliases and functions
>
> alias rm='rm -i'
> alias cp='cp -i'
> alias mv='mv -i'
>
> # Source global definitions
> if [ -f /etc/bashrc ]; then
>     . /etc/bashrc
> fi

Hi Bob, I could be wrong but from the cat ~/.bashrc you have shown here, 
the export command isn't there.

regards,
Steve
> What have I done wrong? I just made the same change on a second Fedora 
> 31 computer and it shows 24 hour time ...
>
> users mailing list -- [e-mail]
> To unsubscribe send an email to [e-mail]
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[Bob Goodwin]

On 11/21/19 7:20 PM, Stephen Morris wrote:
> >
>
> Hi Bob, I could be wrong but from the cat ~/.bashrc you have shown 
> here, the export command isn't there.
>
> regards,
> Steve

.
Yes, you are correct, I botched that ... I confused ~/.bashrc and /home.bobg/.bashrc

After correcting that it is:

[bobg@Workstation-1 ~]$ cat ~/.bashrc
# .bashrc

# Source global definitions
if [ -f /etc/bashrc ]; then
    . /etc/bashrc
fi

# User specific environment
if ! [[ "$PATH" =~ "$HOME/.local/bin:$HOME/bin:" ]]
then
     PATH="$HOME/.local/bin:$HOME/bin:$PATH"
fi
export PATH

# Uncomment the following line if you don't like systemctl's auto-paging feature:
# export SYSTEMD_PAGER=

# User specific aliases and functions
export LC_TIME="C"

However after rebooting the computer Thunderbird time is still displayed in the 12 hour AM/PM format on this
f-31 computer.

the other one works.
.

[Ed Greshko]

On 2019-11-22 09:18, Bob Goodwin wrote:
> However after rebooting the computer Thunderbird time is still displayed in the 12 hour AM/PM format on this 
> f-31 computer.

FWIW, I'm just "testing" at the moment.

I edited /usr/bin/thunderbird to add at the very beginning

export LC_TIME=C

I then found that in the T-Bird preferences you need to check the box in

Advanced--->Date and Time Formatting

Regional settings locale: und

Don't have the "Application locale" box checked.

[Ed Greshko]

On 2019-11-16 04:07, Samuel Sieb wrote:
> On 11/15/19 7:27 AM, Bob Goodwin wrote:
> > How to configure 24 hour time, instead of AM/PM, in Thunderbird 62.2.0 nd/or 62.2.2.
> >
> > Presently I have created /usr/bin/thunderbird24h:
> >
> > /usr/bin/thunderbird24h:
> > #!/bin/sh
> > LC_TIME=C
> > export LC_TIME
> > /usr/bin/thunderbird
> >
> > and rebooted but the AM/PM time is still being used. Have I nissed something or has something changed since Fedora-20?
>
> I remember a thread about this a while back and I don't think there was any solution found.  I even tried building my own locale file and that didn't seem to work.

FWIW, I now have this working fine in F31/KDE.

It works fine when launching T-Bird from the "Application Laucher" in the "Favorites" section as well as the "Applications--->Internet" section.  As well as from a keyboard shortcut.

I used the "Edit Applications" function of the Launcher to edit the T-Bird entry in the "Applications--->Internet" section.

I modified that entry to have the command be "LC_TIME=C thunderbird %u".

I then started T-Bird and checked the box in Preferences--->Advanced which is shown as

Regional settings locale: und

I think similar things can be done depending on the desktop in use.  I forget what Bob is using.  :-) :-)

[Bob Goodwin]

On 2019-11-21 20:41, Ed Greshko wrote:
> Advanced--->Date and Time Formatting
>
> Regional settings locale: und

.

I reset Preferences >   Advanced >  Regional  ,...   :und and the 24 
hour time reappeared. Something caused that to change, an update, or 
something else I did? I dunno, but now I know what may fix it if it 
happens again.

Thanks for the help,   Bob

.
I reset this--
Bob Goodwin - Zuni, Virginia, USA

[Stephen Morris]

On 22/11/19 12:18, Bob Goodwin wrote:
> On 11/21/19 7:20 PM, Stephen Morris wrote:
> > >
> >
> > Hi Bob, I could be wrong but from the cat ~/.bashrc you have shown 
> > here, the export command isn't there.
> >
> > regards,
> > Steve
>
> .
> Yes, you are correct, I botched that ... I confused ~/.bashrc and /home.bobg/.bashrc
>
> After correcting that it is:
>
> [bobg@Workstation-1 ~]$ cat ~/.bashrc
> # .bashrc
>
> # Source global definitions
> if [ -f /etc/bashrc ]; then
>    . /etc/bashrc
> fi
>
> # User specific environment
> if ! [[ "$PATH" =~ "$HOME/.local/bin:$HOME/bin:" ]]
> then
>      PATH="$HOME/.local/bin:$HOME/bin:$PATH"
> fi
> export PATH
>
> # Uncomment the following line if you don't like systemctl's auto-paging feature:
> # export SYSTEMD_PAGER=
>
> # User specific aliases and functions
> export LC_TIME="C"
>
> However after rebooting the computer Thunderbird time is still displayed in the 12 hour AM/PM format on this
> f-31 computer.
>
> the other one works.
> .
>
> -- 
> Bob Goodwin - Zuni, Virginia, USA

Hi Bob,
     I don't use the LC_TIME="C" option. What I found with Thunderbird 
72.0a1 was that in order to get Thunderbird to display times in 24 hour 
format, I had to go into Gnome Settings->Details->Date&Time (where I 
already had the time format specified as 24-hour) and turn off the 
Automatic Date & Time setting. Having done this Thunderbird immediately 
displayed times in 24-hour format. The disadvantage with doing this is I 
will potentially lose the automatic catering of Leap Seconds. One 
interesting thing with this 24-hour time setting in the Gnome 
preferences was that while Thunderbird was displaying its times in 12 
hour format, Gnome was displaying times in 24-hour format.
     Once I got Thunderbird displaying times in 24 hour format I then 
installed the ConfigDate addon into Thunderbird to set some "hidden" 
options in Thunderbird to specify how I want the date/time for mail 
received today displayed, what I want for the display for mail received 
this week, and what I want displayed for all other mail.
     In the past when I've used the export function I've had mixed 
success with it in terms of sometimes it would work and sometimes it 
wouldn't. I'm also not sure whether that export works if Thunderbird is 
launched from the desktop, or whether it only works from the bash shell 
Thunderbird is launched from.

regards,
Steve
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[Tim]

On Sat, 2019-11-23 at 14:45 +1100, Stephen Morris wrote:
> What I found with Thunderbird 72.0a1 was that in order to get
> Thunderbird to display times in 24 hour format, I had to go into
> Gnome Settings->Details->Date&Time (where I already had the time
> format specified as 24-hour) and turn off the Automatic Date & Time
> setting. Having done this Thunderbird immediately displayed times in
> 24-hour format. The disadvantage with doing this is I will
> potentially lose the automatic catering of Leap Seconds.

You'll lose more than that.  You'll lose automatic correction of your
time, all year round.  Computers don't keep time very well, and need
tweaking with the real time periodically.  There's a reason that NTP,
and the like, do it all day long.