/*========================================================================
* Function name : gmt_convert_local
* Description : 将格林尼治时间转换为本地时间
* Return type : bool
* Argument :
* : const char* gmt 格林尼治时间 20091105082121
* : char* local 20091105/162121
========================================================================*/
bool gmt_convert_local(const char* gmt, char* local)
{
if ( strlen(gmt) != 14 )
return false;
//格林尼治时间转换为本地时间
char year[5];
char month[3];
char day[3];
char hour[3];
char minute[3];
char second[3];
sscanf(gmt, "%4s%2s%2s%2s%2s%2s", year, month, day, hour, minute, second);
tm utc_time;
tm local_time;
utc_time.tm_year = atoi(year);
utc_time.tm_mon = atoi(month);
utc_time.tm_mday = atoi(day);
utc_time.tm_hour = atoi(hour);
utc_time.tm_min = atoi(minute);
utc_time.tm_sec = atoi(second);
time64_t time_second = mktime64(&utc_time, 0);//utc时间， 0 时区
localtime64(&local_time, time_second,8);
return true;
}
int main(void) {
Time64_T time = 12345678987654321LL;
char* ctime_ret1;
char* ctime_ret2;
char ctime_buf1[35];
/* The ctime() function shall convert the time pointed to by clock, representing time
in seconds since the Epoch, to local time in the form of a string. It shall be equivalent
to: asctime(localtime(clock)) (ISO)
*/
is_str( ctime64(&time), asctime64(localtime64(&time)), "ctime64()" );
/* The asctime(), ctime(), gmtime(), and localtime() functions shall return values in
one of two static objects: a broken-down time structure and an array of char. Execution
of any of the functions may overwrite the information returned in either of these
objects by any of the other functions. (POSIX)
*/
ctime_ret1 = ctime64(&time);
time++;
ctime_ret2 = ctime64(&time);
is_str( ctime_ret1, ctime_ret2, " return is static" );
/* The ctime_r() function shall convert the calendar time pointed to by clock to local
time in exactly the same form as ctime() and put the string into the array pointed
to by buf (which shall be at least 26 bytes in size) and return buf.
(We need 35 bytes) (POSIX)
*/
ctime_ret1 = ctime64_r(&time, ctime_buf1);
is_str( ctime_ret1, ctime_buf1, "ctime64_r()" );
is_str( ctime_ret1, asctime64(localtime64(&time)), " right time" );
/* Unlike ctime(), the thread-safe version ctime_r() is not required to set tzname. (ISO)
(I don't understand)
*/
/* Upon successful completion, ctime_r() shall return a pointer to the string pointed to
by buf. When an error is encountered, a null pointer shall be returned. (POSIX)
(Can't think of any way to make it error)
*/
done_testing();
return 0;
}
char *ctime64( const Time64_T* time ) {
return asctime64(localtime64(time));
}
char *ctime64( const Time64_T* time ) {
tzset();
return asctime64(localtime64(time));
}
