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std::tm(3) C++ Standard Libary std::tm(3) NAME std::tm - std::tm Synopsis Defined in header <ctime> struct tm; Structure holding a calendar date and time broken down into its com- ponents. Member objects seconds after the minute [0, 61] int tm_sec (until C++11) [0, 60] (since C++11)^[note 1] (public member object) int tm_min minutes after the hour [0, 59] (public member object) int tm_hour hours since midnight [0, 23] (public member object) int tm_mday day of the month [1, 31] (public member object) int tm_mon months since January [0, 11] (public member object) int tm_year years since 1900 (public member object) int tm_wday days since Sunday [0, 6] (public member object) int tm_yday days since January 1 [0, 365] (public member object) Daylight Saving Time flag. The value is positive if DST is in effect, int tm_isdst zero if not and negative if no information is available (public member object) Notes The Standard mandates only the presence of the aforementioned mem- bers in either order. The implementations usually add more data-members to this structure. 1. Range allows for a positive leap second. Two leap seconds in the same minute are not allowed (the range 0..61 was a defect introduced in C89 and corrected in C99) Example Show the start of calendar time. // Run this code #include <ctime> #include <iostream> int main() { std::tm start{}; start.tm_mday = 1; std::mktime(&start); std::cout << std::asctime(&start) << "sizeof(std::tm) = " << sizeof(std::tm) << '\n'; } Possible output: Mon Jan 1 00:00:00 1900 sizeof(std::tm) = 56 See also localtime converts time since epoch to calendar time expressed as local time (function) converts time since epoch to calendar time expressed as Universal gmtime Coordinated Time (function) http://cppreference.com 2022.07.31 std::tm(3)
NAME | Synopsis | Member objects | Notes | Example | Possible output: | See also
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