The description for daylight time as a string of the form path, -stringID. The display name as a string of the form path, -stringID. Settings for each time zone are stored in the following registry key: HKEY_LOCAL_MACHINE SOFTWARE Microsoft Windows NT CurrentVersion Time Zones time_zone_nameĮach time zone entry includes the following registry values. In most time zones, the value of this member is –60. This value is added to the value of the Bias member to form the bias used during daylight saving time. This member is ignored if a value for the DaylightDate member is not supplied. The bias value to be used during local time translations that occur during daylight saving time. If this date is specified, the StandardDate member in this structure must also be specified. If the time zone does not support daylight saving time or if the caller needs to disable daylight saving time, the wMonth member in the SYSTEMTIME structure that contains a date and local time when the transition from standard time to daylight saving time occurs on this operating system. The string will be returned unchanged by the For example, "PDT" could indicate Pacific Daylight Time. In most time zones, the value of this member is zero.Ī description for daylight saving time. This value is added to the value of the Bias member to form the bias used during standard time. This member is ignored if a value for the StandardDate member is not supplied. The bias value to be used during local time translations that occur during standard time. Otherwise, it is a relative date that occurs yearly. If the wYear member is not zero, the transition date is absolute it will only occur one time. Specify 02:00 on the last Thursday in October as follows: wHour = 2, wMonth = 10, wDayOfWeek = 4, wDay = 5. Using this notation, specify 02:00 on the first Sunday in April as follows: wHour = 2, wMonth = 4, wDayOfWeek = 0, wDay = 1. To select the correct day in the month, set the wYear member to zero, the wHour and wMinute members to the transition time, the wDayOfWeek member to the appropriate weekday, and the wDay member to indicate the occurrence of the day of the week within the month (1 to 5, where 5 indicates the final occurrence during the month if that day of the week does not occur 5 times). Otherwise, the system assumes the time zone data is invalid and no changes will be applied. If this date is specified, the DaylightDate member of this structure must also be specified. SYSTEMTIME structure that contains a date and local time when the transition from daylight saving time to standard time occurs on this operating system. For example, "EST" could indicate Eastern Standard Time. All translations between UTC and local time are based on the following formula:Ī description for standard time. The bias is the difference, in minutes, between Coordinated Universal Time (UTC) and local time. The current bias for local time translation on this computer, in minutes. Syntax typedef struct _TIME_ZONE_INFORMATION TIME_ZONE_INFORMATION, *PTIME_ZONE_INFORMATION, *LPTIME_ZONE_INFORMATION
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