Daylight or standard time

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bwolfsohn
Posts: 649
Joined: Thu Jan 28, 2010 7:07 am
Location: Alachua, Florida USA
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Daylight or standard time

#1 Post by bwolfsohn »

I'm drawing a blank here...

when displaying the time, i'd like to also display whether it's daylight standard time or daylight savings time.

there's a windows function that will return that, but i have never done wrappers for that...

https://msdn.microsoft.com/en-us/librar ... 2147217396

DWORD WINAPI GetDynamicTimeZoneInformation(
_Out_ PDYNAMIC_TIME_ZONE_INFORMATION pTimeZoneInformation
);

if it returns a 2,. it's daylight savings time, otherwise it's standard time.

does anyone have a function that handles this ?? or, can you tell me how to call it ??
Brian Wolfsohn
Retired and traveling around the country to music festivals in my RV.
OOPS.. Corona Virus, so NOT traveling right now...
http://www.breadmanrises.com
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Auge_Ohr
Posts: 1422
Joined: Wed Feb 24, 2010 3:44 pm

Re: Daylight or standard time

#2 Post by Auge_Ohr »

bwolfsohn wrote:when displaying the time, i'd like to also display whether it's daylight standard time or daylight savings time.

there's a windows function that will return that, but i have never done wrappers for that...

https://msdn.microsoft.com/en-us/librar ... 2147217396

DWORD WINAPI GetDynamicTimeZoneInformation(
_Out_ PDYNAMIC_TIME_ZONE_INFORMATION pTimeZoneInformation
);

if it returns a 2,. it's daylight savings time, otherwise it's standard time.
it is a Structure, read here https://msdn.microsoft.com/en-us/librar ... 85%29.aspx
bwolfsohn wrote:does anyone have a function that handles this ?? or, can you tell me how to call it ??
as i remember StandardDate/DaylightDate are SYSTEMTIME Structure
(https://msdn.microsoft.com/en-us/librar ... 85%29.aspx)
it does contain Start Day / End Day of Daylightsaving.

if you just need Day, not Time Bias, you can calculate it with this
Daylight.ZIP
(409 Bytes) Downloaded 776 times
greetings by OHR
Jimmy

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