< cpp‎ | chrono‎ | c
Defined in header <ctime>
std::time_t time( std::time_t* arg );

Returns the current calendar time encoded as a std::time_t object, and also stores it in the object pointed to by arg, unless arg is a null pointer.


[edit] Parameters

arg - pointer to a std::time_t object to store the time, or a null pointer

[edit] Return value

Current calendar time encoded as std::time_t object on success, (std::time_t)(-1) on error. If arg is not null, the return value is also stored in the object pointed to by arg.

[edit] Notes

The encoding of calendar time in std::time_t is unspecified, but most systems conform to POSIX specification and return a value of integral type holding the number of seconds since the Epoch. Implementations in which std::time_t is a 32-bit signed integer (many historical implementations) fail in the year 2038.

[edit] Example

#include <ctime>
#include <iostream>
int main()
    std::time_t result = std::time(nullptr);
    std::cout << std::asctime(std::localtime(&result))
              << result << " seconds since the Epoch\n";


Wed Sep 21 10:27:52 2011
1316615272 seconds since the Epoch

[edit] See also

converts time since epoch to calendar time expressed as local time
(function) [edit]
converts time since epoch to calendar time expressed as Universal Coordinated Time
(function) [edit]
wall clock time from the system-wide realtime clock
(class) [edit]