GetTimeZoneInformationForHandle

GetTimeZoneInformation is a Windows API function that retrieves information about the system's current time zone. It is part of the Windows API and is used by applications to understand and display local time correctly. The function populates a TIME_ZONE_INFORMATION structure, which contains various details about the time zone.

The TIME_ZONE_INFORMATION structure includes the standard and daylight saving time (DST) names for the time zone, such as "Eastern Standard Time" and "Eastern Daylight Time". It also stores the bias, which is the difference in minutes between Coordinated Universal Time (UTC) and local time when DST is not in effect. Additionally, the structure contains the standard time bias and the daylight bias, which are the differences from UTC when DST is not active and when it is active, respectively.

Furthermore, GetTimeZoneInformation provides information about the transition dates and times for DST. It specifies the month, day, time, and day of the week when DST begins and ends. This allows applications to accurately adjust the clock for DST changes. Applications can call GetTimeZoneInformation to obtain this data and then use it for date and time calculations, displaying local times to users, or performing time-sensitive operations. It's a fundamental function for handling time zone complexities within the Windows operating system.