Question

这是一个用于说明问题的小代码示例：

enter code here
var offset1 = DateTimeZoneProviders.Tzdb.GetZoneOrNull("Europe/Moscow")
            .GetUtcOffset(Instant.FromDateTimeUtc(DateTime.UtcNow));
var offset2 = DateTimeZoneProviders.Tzdb.GetZoneOrNull("Etc/GMT+3")
            .GetUtcOffset(Instant.FromDateTimeUtc(DateTime.UtcNow));

Console.WriteLine(offset1 + " vs " + offset2);

结果＆＃34; {+ 03} vs {-03}＆＃34;

Answer 1

是的，这是对的。那是因为＆＃34; Etc / GMT + X＆＃34;区域ID令人困惑。它们与POSIX TZ字符串匹配，这些字符串由于某种原因表示UTC与本地时间的偏移＆＃34;而不是当地时间与UTC＆＃34;的正常偏差。请参阅维基百科list of tz database time zone以确认。

来自etcetra文件：

# Be consistent with POSIX TZ settings in the Zone names,
# even though this is the opposite of what many people expect.
# POSIX has positive signs west of Greenwich, but many people expect
# positive signs east of Greenwich.  For example, TZ='Etc/GMT+4' uses
# the abbreviation "-04" and corresponds to 4 hours behind UT
# (i.e. west of Greenwich) even though many people would expect it to
# mean 4 hours ahead of UT (i.e. east of Greenwich).

如果要创建表示固定偏移量的时区，可以使用＆＃34; UTC + X＆＃34;的标识符。或使用DateTimeZone.ForOffset。

NodaTime时区解析：Etc / GMT + 3偏移为负

1 个答案: