TZUTC: -0800   
   MSGID: 57056.sync_sys@1:103/705 2bcc0240   
   PID: Synchronet 3.20a-Linux master/bbf9d5eac Dec 14 2024 GCC 12.2.0   
   TID: SBBSecho 3.23-Linux master/d0e0e8c90 Dec 19 2024 GCC 12.2.0   
   BBSID: VERT   
   CHRS: ASCII 1   
   open https://gitlab.synchro.net/main/sbbs/-/issues/845   
      
   The SMB `when_written.time` message header field is supposed to reflect the   
   wallclock time at the site a message was written. This value is initialized   
   with the return value of time() for locally posted messages and in most cases   
   for networked messages, is initialized by parsing a date/time string into a   
   `struct tm` and converting that value to a `time[32]_t` by calling   
   `mktime[32]()`.   
      
   Unfortunately, time_t doesn't store/reflect Wallclock time, it stores an   
   absolute/global time (in UTC). When the time is displayed, it can be displayed   
   in UTC (e.g. using `gmtime[_r]()`) or displayed in the equivalent local time   
   (using `localtime[_r]()`) as is usually the case. Unfortunately, the   
   conversion to local time uses the *current* system/OS time zone. So if that   
   time zone was changed at any point (to a different UTC offset, not counting   
   changes between daylight and standard time), then the displayed time of the   
   post no longer reflects the local/wallclock date/time at the site of the   
   author/poster.   
      
   `time_t` and the underlying conversion functions are not a good choice for   
   storing a wallclock time. Storing an encoding of a ISO-8601 date/time stamp   
   would be a better choice.   
      
   Create to Deon for asking good questions and making me rethink this 30 year   
   old design.   
   --- SBBSecho 3.23-Linux   
    * Origin: Vertrauen - [vert/cvs/bbs].synchro.net (1:103/705)   
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