将 Unix time_t 与任意时区相互转换的最佳方法？
我的代码从外部源接收 time_t 。然而，time_t 实际上并不是基于 UTC 纪元时间，随之我得到一个时区字符串（例如，EDT、PST 等），并且它基于这个偏移纪元。我需要将其转换为真正的基于 UTC Epoch 的 time_t。
此外，我需要能够朝相反的方向前进，采用基于 UTC 纪元的 time_t 和时区，并创建偏移的 time_t，但在这种情况下，我没有像 EDT/PST 这样的时区，等等， Unix 风格的时区描述，如“美国/纽约”，需要根据夏令时转换为正确的时区，因此我需要从算法中返回偏移的 time_t 和正确的描述符（EDT、EST）。
我很确定我可以通过临时更改 tzset() 以及分解时间、time_t 和 timeval 之间的转换组合来实现这一目标，但这样做总是让我的大脑受伤，让我觉得我错过了一些明显的东西。任何人都可以推荐一些代码或 sudo 代码来执行此操作，或者至少推荐一个正确的方法吗？
My code receives a time_t from an external source. However, that time_t isn't acutally based on UTC Epoch time, along with it I get a timezone string (eg, EDT, PST, etc), and its based on this offset'ed epoch. I need to convert this to a true UTC Epoch based time_t.
Additionally, I need to be able to go in the opposite direction, taking a UTC Epoch based time_t and a timezone, and create the offsetted time_t, but in this situation instead of having a timezone like EDT/PST), etc, I have a Unix style timezone description like "America/New York" and need to convert to the correct timezone given daylight savings, so I'd need to get back from the algorithm, both an offsetted time_t, and the correct descriptor (EDT,EST).
I'm pretty sure I can pull this off by temporarily changing tzset() and some combination of conversions between broken-down time, time_t and timeval, but doing this always makes my brain hurt and makes me feel like I'm missing something obvious. Can anyone recommend some code or sudo-code to do this or at least a proper approach?
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time_t以秒为单位，因此只需将time_t值偏移时区偏移小时数的 3600 倍即可。只要您有明确标识的偏移量（即 EST 或 EDT 而不是 US/Eastern 或 EST5EDT 等），那么这非常简单并且不容易出错。time_tis in seconds, so just offset yourtime_tvalues by 3600 times the number of hours the timezone is offset by. As long as you have the offset specifically identified (i.e. EST or EDT instead of US/Eastern or EST5EDT or whatnot) then this is really simple and not prone to errors.这些功能对您有帮助吗？ localtime()、gmtime() 等
would any of these functions help you? localtime(), gmtime(), etc.