Timezones explained Rated 5 out of 5 stars

Great extension. Some explanation on time zones - local vs. sender.The following reserved words always use sender's time zone:
%date%, %datelocal%, %dateshort%, %date_tz%.

So if you want to use original time zone in your reply, then use them and you are lucky. But if you are like me, and you want to use your local time zone, then you must use other words. The following reserved words always use your local time zone:
%Y% %m% / %n% %d% / %e% %H% / %k% %I% / %l% %M% %S% %p% / %p(x)% %A% / %a% %B% / %b%.

As you however know, these reserved words return current date and time. But you can easily switch them to the time the original message was sent. Just place %X:=sent% before them. For example:
%X:=sent%%a% %b% %e% %Y% %k%:%M%:%S%
If you later want to use today's time, you can switch back by inserting %X:=today%.
For example:
%X:=sent%%k%:%M%:%S% vs. %X:=today%%k%:%M%:%S%
will produce two different times. The first time is the time when the mail was sent and the second one is current time. Both use your time zone and not the sender's one. Example output may look:
20:34:03 vs. 15:08:01

So it's almost everything we need. But I also wanted a timezone in the string, in the format:
Date: Thu Jan 13 2011 20:34:03 GMT+0100 (Central Europe Standard Time)

But there's no reserved word neither for your local time zone offset nor for your local time zone name. I could just manually put +0100 but it may change due to daylight saving. So I modified the version 0.6 and added two new reserved words:
TZ ... local time zone offset
TZ_NAME ... local time zone long name
So the desired pattern for the Date field with my local time zone looks as follows:
Date: %X:=sent%%a% %b% %e% %Y% %k%:%M%:%S% GMT%TZ% (%TZ_NAME%)

If you are interested in these two new reserved words, you can download modified extension from http://rapidshare.com/#!download|47l32|442537343|smarttemplate-0.6.0-tb_timezones.xpi|36