如何确定当前本地时间是否为夏令时
How to find out if the current local time is in daylight savings
GetTimeZoneInformation 用各种有用的信息填充 TIME_ZONE_INFO 结构。
除了它实际上没有告诉我当前本地时区是否在夏令时。
就此而言，我在纽约，StandardBias 和 DaylightBias 都和 Bias 说同样的话。
怎么回事？
GetTimeZoneInformation的return代码包含您想要的信息。
根据 MSDN：
If the function succeeds, it returns one of the following values.
TIME_ZONE_ID_UNKNOWN
0
Daylight saving time is not used in the current time zone, because there are no transition dates or automatic adjustment for daylight saving time is disabled.
TIME_ZONE_ID_STANDARD
1
The system is operating in the range covered by the StandardDate member of the TIME_ZONE_INFORMATION structure.
TIME_ZONE_ID_DAYLIGHT
2
The system is operating in the range covered by the DaylightDate member of the TIME_ZONE_INFORMATION structure.
If the function fails for other reasons, such as an out of memory error, it returns TIME_ZONE_ID_INVALID. To get extended error information, call GetLastError.
确保检查 return 代码以确保您收到的信息确实有效。
GetTimeZoneInformation 用各种有用的信息填充 TIME_ZONE_INFO 结构。
除了它实际上没有告诉我当前本地时区是否在夏令时。
就此而言，我在纽约，StandardBias 和 DaylightBias 都和 Bias 说同样的话。
怎么回事？
GetTimeZoneInformation的return代码包含您想要的信息。
根据 MSDN：
If the function succeeds, it returns one of the following values.
TIME_ZONE_ID_UNKNOWN
0
Daylight saving time is not used in the current time zone, because there are no transition dates or automatic adjustment for daylight saving time is disabled.TIME_ZONE_ID_STANDARD
1
The system is operating in the range covered by the StandardDate member of theTIME_ZONE_INFORMATIONstructure.TIME_ZONE_ID_DAYLIGHT
2
The system is operating in the range covered by the DaylightDate member of theTIME_ZONE_INFORMATIONstructure.If the function fails for other reasons, such as an out of memory error, it returns TIME_ZONE_ID_INVALID. To get extended error information, call
GetLastError.
确保检查 return 代码以确保您收到的信息确实有效。