Difference between revisions of "cpp/chrono/c/gmtime"
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std::tm* gmtime( const time_t* time ); | std::tm* gmtime( const time_t* time ); | ||
Revision as of 12:25, 15 June 2012
| Defined in header <ctime>
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| std::tm* gmtime( const time_t* time ); |
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Converts given time since epoch as std::time_t value into calendar time, expressed in Coordinated Universal Time (UTC).
Contents |
Parameters
| time | - | pointer to a time_t object to convert |
Return value
Pointer to a static internal std::tm object on success, or NULL otherwise. The structure may shared between std::gmtime, std::localtime, and std::ctime and may be overwritten on each invocation.
Notes
This function may not be thread-safe.
POSIX requires that this function sets errno to EOVERFLOW if it fails because the argument is too large.
Example
Run this code
#include <iostream> #include <iomanip> #include <ctime> int main() { std::time_t t = std::time(NULL); std::cout << "UTC: " << std::put_time(std::gmtime(&t), "%c %Z") << '\n' << "local: " << std::put_time(std::localtime(&t), "%c %Z") << '\n'; }
Output:
UTC: Wed Dec 28 11:44:28 2011 GMT local: Wed Dec 28 06:44:28 2011 EST
See also
| C documentation for gmtime
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