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In other words, you can't calculate anycodings_timezone daylight saving time properly if all you anycodings_timezone have for input is an offset. anycodings_timezone If you ask for the time zone IDs anycodings_timezone corresponding to GMT-7:00, you'll get anycodings_timezone back an enumeration over two time zone anycodings_timezone IDs: "America/Denver," which corresponds anycodings_timezone to Mountain Standard Time in the winter anycodings_timezone and Mountain Daylight Time in the anycodings_timezone summer, and "America/Phoenix", which anycodings_timezone corresponds to Mountain Standard Time anycodings_timezone year-round, even in the summer. anycodings_timezone For example, the state of Arizona anycodings_timezone doesn't observe daylight savings time.

There may be several times zones with anycodings_timezone the same GMT offset that differ in the anycodings_timezone way they handle daylight savings time. TimezoneOffset = (stdOffset / (1000 * 60 * 60) + dstOffset / (1000 * 60 * 60)) ĮrrorName = u_errorName(ec) // The error name is "bogus error" TzWest->getOffset(curDate, false, stdOffset, dstOffset, success) U_ICU_NAMESPACE::TimeZone *tzWest = U_ICU_NAMESPACE::TimeZone::createTimeZone(*next) U_ICU_NAMESPACE::StringEnumeration* se = U_ICU_NAMESPACE::TimeZone::createEnumeration(rawOffset) // Obtain timezones by GMT timezone offset Int32_t rawOffset = timezoneOffset * 3600 * 1000 U_ICU_NAMESPACE::Calendar* calendar = U_ICU_NAMESPACE::Calendar::createInstance(success) U_ICU_NAMESPACE::UnicodeString dateReturned, curTZNameEn, curTZNameFr I would like to use the ICU library to anycodings_icu obtain the current time by given timezone anycodings_icu offset (also need to calculate the daylight anycodings_icu saving), I've tried below codes, but the anycodings_icu snext function return NULL, the ICU library anycodings_icu version is 6.1, CentOS 7.6 64 bit + gcc anycodings_icu 6.4.1.