std::time

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

Returns the current calendar time encoded as a std::time_t object.

Contents

[edit] Parameters

time - pointer to a std::time_t object to store the time in or NULL

[edit] Return value

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

[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";
}

Output:

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)
converts time since epoch to calendar time expressed as Universal Coordinated Time
(function)
(C++11)
wall clock time from the system-wide realtime clock
(class)
C documentation for time