Bug 14792 – Add function to convert from unix time to SysTime

SysTime currently has toUnixTime to convert to unix time (which is what time_t usually is, though apparently, the C standard does not require it to be unix time, and in the case of dmc, it isn't). However, SysTime does not provide a way to convert from unix time to SysTime. We have stdTimeToUnixTime and unixTimeToStdTime to do the conversions of the integral values, but while toUnixTime wraps stdTimeToUnixTime for you, in the case of converting to from unix time, you currently have to do something like auto st = SysTime(unixTimeToStdTime(myTimeT)); It's been requested on multiple occasions that we have a function like toUnixTime except that it does the conversion in the opposite direction, thus allowing for code like auto st = SysTime.fromUnixTime(myTimeT);

Commits pushed to master at https://github.com/D-Programming-Language/phobos https://github.com/D-Programming-Language/phobos/commit/4899aa85d22114cd56be87ec8cb243d2a13f5b1e Implement issue# 14792: Add SysTime.fromUnixTime. We've had the ability to convert from unix time to SysTime, but it has been more unwieldy than it should be. This adds fromUnixTime to go with toUnixTime. In addition, these changes solve the problem where you sometimes need a value for unix time that doesn't fit in time_t (e.g. a 64-bit value on a 32-bit system), or you're dealing with a 64-bit time_t on a 32-bit system (which Windows sometimes does). So, toUnixTime and stdTimeToUnixTime now take an optional template argument which indicates how many bits the result should be (defaulting to match the size of time_t), and fromUnixTime and unixTimeToStdTime now take long rather than time_t so that they can accept 64-bit values on 32-bit systems. https://github.com/D-Programming-Language/phobos/commit/a9cd76147fbb87e0326c3e302119a7eb0e531d6d Merge pull request #3481 from jmdavis/issue14792 Implement issue# 14792: Add SysTime.fromUnixTime.

Commits pushed to stable at https://github.com/D-Programming-Language/phobos https://github.com/D-Programming-Language/phobos/commit/4899aa85d22114cd56be87ec8cb243d2a13f5b1e Implement issue# 14792: Add SysTime.fromUnixTime. https://github.com/D-Programming-Language/phobos/commit/a9cd76147fbb87e0326c3e302119a7eb0e531d6d Merge pull request #3481 from jmdavis/issue14792