std::time

From Cppreference

Returns the current calendar time encoded as a time_t object.

[edit] Parameters

[edit] Return value

Current calendar time encoded as time_t object on success, (time_t)(-1) on error. If the argument is not NULL, the return value is equal to the value stored in the object pointed to by the argument.

[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 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(NULL);
    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