>> They're not broken in non-DST timezones.
>
>This is like writing code that assumes a month has >=30 days and then
>protesting "it's not broken in non-February months".  DST-using
>timezones _do_ occur, just as do Februarys, however inconvenient they
>may be for application authors.

indeed!  and dst can shift randomly.  witness (parts of) brasil of
this year.

one merely needs to decide if adding one hour means an hour of actual
time, or an hour of wall-clock time, similarly for one day, and act
accordingly.  ignoring the fact that dst *exists* is just asking for
trouble.

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