Tutorial :Getting current time of a different timezone using C++



Question:

How do i get the current time of a different time zone? Example, i need to know the current time in Singapore where as my system is set to PT time.


Solution:1

One implementation would be to use time to get the current time in UTC and then manipulate the TZ environment variable to your destination timezone. Then use localtime_r to convert to that timezone's local time.


Solution:2

New answer for a very old question.

Given a C++11 or C++14 compiler, and this timezone library, the current time in Singapore is:

#include "tz.h"  #include <iostream>    int  main()  {      using namespace std::chrono;      std::cout << date::make_zoned("Asia/Singapore", system_clock::now()) << '\n';  }  

which just output for me:

2015-08-19 05:25:05.453824 SGT  

This gives the current local date, time and abbreviation in use. And it is based off of the <chrono> library and the IANA timezone database.

std::chrono::system_clock::now() returns a time stamp in the UTC timezone. This program locates the timezone information for "Asia/Singapore", and translates the UTC timestamp into a pair representing the local time and the current timezone for that location.

The above program is independent of the computer's current timezone.


Solution:3

Use UTC (GMT) as much as possible.

If you need to (for example) print a report that's going to another time zone, use something like SystemTimeToTzSpecificLocalTime() to localise it.


Solution:4

You could convert to GMT then convert to whatever time zone you want.


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