Defined in header <ctime> | ||
|---|---|---|
struct tm; |
Structure holding a calendar date and time broken down into its components.
| int tm_sec | seconds after the minute – [0, 61] (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) |
| int tm_isdst | Daylight Saving Time flag. The value is positive if DST is in effect, zero if not and negative if no information is available (public member object) |
The Standard mandates only the presence of the aforementioned members in some order. The implementations usually add more data members to this structure.
#include <ctime>
#include <iostream>
int main()
{
std::tm tm{};
tm.tm_year = 2022-1900;
tm.tm_mday = 1;
std::mktime(&tm);
std::cout << std::asctime(&tm)
<< "sizeof(std::tm) = "
<< sizeof(std::tm) << '\n';
}Possible output:
Sat Jan 1 00:00:00 2022 sizeof(std::tm) = 56
| converts time since epoch to calendar time expressed as local time (function) |
|
| converts time since epoch to calendar time expressed as Universal Coordinated Time (function) |
|
C documentation for tm |
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