CODEWITHSUNDEEP
c++datetimeboosttimezone
0x26res
0x26res

Reputation: 13892

Convert UTC time to custom time zone with boost

I'm trying to convert a UTC time to a custom time zone. I've read a lot of questions about it here and there but they all seem to do the opposite, or to use a time adjustor where you can't set the timezone. So far here what I've managed to do:

 boost::local_time::time_zone_ptr           time_zone(new boost::local_time::posix_time_zone("EST5EDT,M3.2.0,M11.1.0"));
 boost::posix_time::ptime const             now(boost::gregorian::date(2004,11,5), boost::posix_time::hours(10));
 boost::local_time::local_date_time  const  ny(now, time_zone );
 //
 ny.utc_time().time_of_day();     // Expected: 10:00 Actual: 10:00
 ny.local_time().time_of_day();   // Expected: 04:00  Actual: 16:00

I want ny.local_time() to show be 04:00, because when UTC time is 10:00, it's 4:00 in new york.

Can anyone suggest the right way to do it ?

Upvotes: 0

Views: 2160

Answers (1)

Mike Seymour
Mike Seymour

Reputation: 254431

The boost library seems to interpret the "offset" as the amount to add to UTC to get the local time; while the standard POSIX convention is the other way round. Change it to

"EST-5EDT,M3.2.0,M11.1.0"
    ^

Upvotes: 2

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