From Garmin Support:
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Time Zone Map software version 29.00, available
Attachment 3525
Gmaptz, Time Zone Map software version 32.00, available GE
Hopefully some kind soul will upload it somewhere where others, who have older unsupported units that Garmin doesn't provide updates for anymore, can get it.
I had trouble finding an upload of v31.00 a while back.
PS: Garmin Basecamp also uses gmaptz.img. Garmin used to make the file available for download but stopped that years ago.
Not sure why you are having difficulty ,as Garmin Express offers this to my oldest & newest devices nearly 20 years apart ? What device do you have ?
Attachment 4013
Time Zone Map
Version: 32.00 File Size: 576.52 KB Installation Time: 1 minute
• Updated Daylight Saving Time data for Mexico and Greenland.
• Improved time zone borders.
• Updated Daylight Saving Time for some areas and countries.
• Updated the Europe/Kiev time zone name to Europe/Kyiv.
• Emergency update.
• Improved time zone borders.
• Updated Daylight Saving Time for some areas.
I avoid Garmin Express (GE) like the plague. I do have it in a Virtual Machine in case I need it.
I did try WebUpdater 2.5.8 (still works) on a real machine and it found no "Time Zone Map" updates.
I have multiple "obsolete" units that haven't had any updates in years (via GE or Webupdater). I'll try GE sometime and see if it offers gmaptz.img.
I do know that Garmin no longer offers gmaptz.img as a download. To them it seems to be use GE or nothing.