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https://docs.microsoft.com/en-us/windows/win32/sysinfo/local-time

Local Time. 05/31/2018; 2 minutes to read; m; v; D; d; m; In this article. While the system uses UTC-based time internally, your applications will generally display the local time, which is the date and time of day for your time zone.Therefore, to ensure correct results, you must be aware of whether a function expects to receive a UTC-based time or a local time, and whether the function ...

https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/localtime-localtime32...

If the TZ environment variable is set, the C run-time library assumes rules appropriate to the United States for implementing the calculation of daylight-saving time (DST).. Remarks. The localtime function converts a time stored as a time_t value and stores the result in a structure of type tm.The long value sourceTime represents the seconds elapsed since midnight (00:00:00), January 1, 1970, UTC.

https://support.microsoft.com/en-us/windows/how-to-set-your-time-and-time-zone-dfaa...

In Date & time, you can choose to let Windows 10 set your time and time zone automatically, or you can set them manually. To set your time and time zone in Windows 10, go to Start > Settings > Time & language > Date & time. Open Date & time settings.

https://support.microsoft.com/en-us/topic/how-to-convert-utc-time-to-local-time-0569c...

If your local time zone is not selected, click it in the list of available time zones. The local time offset is shown at the start of each local region list item. For example, -5:00 is the local time offset for Eastern Time (US & Canada): (GMT-5:00) Eastern Time (US & Canada) Add the local time offset to the UTC time. For example, if your local ...

https://docs.microsoft.com/en-us/windows/win32/api/sysinfoapi/nf-sysinfoapi-getlocaltime

Retrieves the current local date and time. To retrieve the current date and time in Coordinated Universal Time (UTC) format, use the GetSystemTime function. Syntax void GetLocalTime( LPSYSTEMTIME lpSystemTime ); Parameters. lpSystemTime. A pointer to a SYSTEMTIME structure to receive the current local date and time. Return value. None. Remarks