Function GetCurrentTimestamp

src/backend/utils/adt/timestamp.c:1932–1945

* GetCurrentTimestamp -- get the current operating system time * * Result is in the form of a TimestampTz value, and is expressed to the * full precision of the gettimeofday() syscall */

 * full precision of the gettimeofday() syscall
 */
TimestampTz
GetCurrentTimestamp(void)
{
	TimestampTz result;
	struct timeval tp;

	gettimeofday(&tp, NULL);

	result = (TimestampTz) tp.tv_sec -
		((POSTGRES_EPOCH_JDATE - UNIX_EPOCH_JDATE) * SECS_PER_DAY);
	result = (result * USECS_PER_SEC) + tp.tv_usec;

	return result;
}

/*
 * GetSQLCurrentTimestamp -- implements CURRENT_TIMESTAMP, CURRENT_TIMESTAMP(n)