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搞不懂时间、时间戳、时区,快来看这篇
2022-04-23 08:57:00 【InfoQ】

typedef long time_t;
struct tm {
int tm_sec;
int tm_min;
int tm_hour;
int tm_mday;
int tm_mon;
int tm_year;
int tm_wday;
int tm_yday;
int tm_isdst;
};
struct tm *gmtime(time_t const *time_value); // 时间戳转 UTC 时间
char *setlocale(int category, char const *locale); // 设置Local
struct tm *localtime(time_t const *time_value); // 时间戳转本地时间
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