Clock change notification at DST change

[TechoMad]

Simple really, does Windows send a WM_TIMECHANGE message to all programs when
the daylight saving time shift occurs? I suspect not, but what if I want my
application to "know" that DST has become/stopped being operative?

 

[MPaquette]

Some applications rely on the local computer clock some do not. You would
have to research each application to find out how they get their time.

 

[TechoMad]

The application does use the clock, that is why I asked - if it didn't, it
wouldn't matter. The question still stands, when a daylight saving point is
reached, does the Windows OS inform the applications through a WM_TIMECHANGE
message, so they are aware of the event?

 

[PA Bear [MS MVP]]

No.

The application does use the clock, that is why I asked - if it didn't, it
wouldn't matter. The question still stands, when a daylight saving point
is
reached, does the Windows OS inform the applications through a
WM_TIMECHANGE
message, so they are aware of the event?

 

[TechoMad]

Disappointing if confirmed; I've now run a test and it looks like it does on
SP3, I need to repeat the run on SP2.

 

[TechoMad]

Tests on SP2 and SP3 show that a WM_TIMECHANGE event does arrive when the
daylight saving change events occur, so that's all right then - I can make my
program do what I need.

 

[PA Bear [MS MVP]]

I'm glad I forced you to do your own research.

Tests on SP2 and SP3 show that a WM_TIMECHANGE event does arrive when the
daylight saving change events occur, so that's all right then - I can make
my program do what I need.