2013年7月18日 · localtime_s is just a microsoft implementation of the localtime functon, you can safely keep using locatime becaue it's C++ ISO compliant and ony microsoft marked it as "deprecated". The localtime function itself isn't deprecated at all in the C++ world. The localtime_s reference says that these parameters should be passed to it:

2011年11月7日 · the localtime() call stores the results in an internal buffer. Every time you call it you overwrite the buffer. An alternative solution would be to make a copy of the buffer. time_t t1 = time(0); // get time now struct tm* now = localtime( & t1 ); // convert to local time struct tm copy = *now; // make a local copy.

2016年6月26日 · localtime can be dangerous to use because it returns a pointer to a memory area which it owns, so if you call it multiple times you need to make sure each time you copy the struct. Also, by the way, the way you create a string, if you get "2112016" you don't know if that's 21/1/2016 or 2/11/2016.

2011年3月23日 · The return value points to a statically allocated struct which might be overwrit‐ ten by subsequent calls to any of the date and time functions. The localtime_r() function does the same, but stores the data in a user- supplied struct. It …

2011年9月6日 · It maintains compatibility with multithreaded environments that provide ::localtime_r and single-threaded environments that provide only std::localtime. It can easily be adapted to check for other functions as well, such as posix::localtime_r or ::localtime_s or what-have-you. namespace query { char localtime_r( ...

It is recommonded to use localtime_s instead of localtime. This should work. time_t current_raw_time = time(0); // System time: number of seconds since 00:00, Jan 1 1970 UTC struct tm day_time; localtime_s(&day_time, &current_raw_time); day_time will have the …

From there, ask for the LocalTime if desired. LocalTime lt = zdt.toLocalTime(); Instant. If you want to see that same moment in UTC, extract an Instant. The Instant class represents a moment on the timeline in UTC with a resolution of nanoseconds (up to nine (9) digits of a decimal fraction).

2015年2月5日 · Note that all existing answers assume the times to be on the same calendar day. That is, the difference between 23:58 and 00:03 would be given as -1435 minutes, not 5 minutes as one might expect.

2012年12月10日 · How does localtime do it? According to localtime man page. The localtime() function acts as if it called tzset(3) and sets the external variables tzname with information about the current timezone, timezone with the difference between Coordinated Universal Time (UTC) and local standard time in seconds

2015年10月2日 · No, you shouldn't. This structure is statically allocated and shared by the functions gmtime and localtime. Each time either one of these functions is called the content of this structure is overwritten. So be careful with results - e.g. copy them immediately and don't store the pointer.