About the parameter TimeZone of wxDateTime::Format Topic is solved

[Ronald]

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wxString wxDateTime::Format  ( const wxString &  format = wxDefaultDateTimeFormat, const TimeZone &  tz = Local)  const 

The doc said nothing about the parameter tz.

wxDateTime contains no info about timezone, and TimeZone is relative, so what does tz relative to?

[Ronald]

I found the answer.

wxDateTime got no info about time zone, it defaults to local.

Consider:

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wxDateTime::ToTimezone
wxDateTime::FromTimezone

wxDateTime::Format's parameter "TimeZone tz" means "ToTimezone".