24 hour time in Thunderbird -

[Bob Goodwin - W2BOD <bobgoodwin@xxxxxxxxxxxx>]

Does anyone know how to get Thunderbird to use 24 hour time when listing 
email "Date?"

I use a large font and need the space that the stupid AM/PM takes for 
useful [to me] information!

I know this is may not be a Fedora question but ...

Bob Goodwin