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Gizmo

Utc To Local Time Conversion

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Does anyone have C code that converts the hour portion of UTC to the local time's hour (offset -5 hours for EST, -4 hours for EDT, in my case)? The answer would seem obvious (UTC minus the offset), but this equation falls apart when UTC is between 00 and 05 hours.

 

Any suggestions please?

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Does anyone have C code that converts the hour portion of UTC to the local time's hour (offset -5 hours for EST, -4 hours for EDT, in my case)? The answer would seem obvious (UTC minus the offset), but this equation falls apart when UTC is between 00 and 05 hours.

 

Any suggestions please?

Perhaps I have misread your problem but how about something like:

 

if (UTC_hour < offset) local_time = (UTC_hour + 24) - offset;
else local_time = UTC_hour - offset;

Regards

 

davidb

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Does anyone have C code that converts the hour portion of UTC to the local time's hour (offset -5 hours for EST, -4 hours for EDT, in my case)? The answer would seem obvious (UTC minus the offset), but this equation falls apart when UTC is between 00 and 05 hours.

 

Any suggestions please?

Perhaps I have misread your problem but how about something like:

 

if (UTC_hour < offset) local_time = (UTC_hour + 24) - offset;
  else local_time = UTC_hour - offset;

Regards

 

davidb

Perfect! Very eloquent.

Thank you David.

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