最近有朋友問如下問題:
#include <stdio.h>
#include <stdlib.h>
#include <iconv.h>
#include <time.h>
int main()
{
struct tm *tms;
time_t now = time(0);
tms = localtime(&now);
printf("%d/n", tms->tm_year);
printf("%d/n", tms->tm_mon);
printf("%d/n", tms->tm_mday);
printf("%d/n", tms->tm_hour);
printf("%d/n", tms->tm_min);
printf("%d/n", tms->tm_sec);
}為什么輸出的年是110，不是2010？輸出的月不是8月而是7月？
這個問題在MSDN上解釋的很清楚了，我不用羅嗦了，直接拿出證據吧。
Return Value
localtime returns a pointer to the structure result. If the value in timer represents a date before midnight, January 1, 1970, localtime returns NULL. The fields of the structure type tm store the following values, each of which is an int:
tm_sec
Seconds after minute (0 – 59)
tm_min
Minutes after hour (0 – 59)
tm_hour
Hours after midnight (0 – 23)
tm_mday
Day of month (1 – 31)
tm_mon
Month (0 – 11; January = 0) //請注意這里
tm_year
Year (current year minus 1900) //還要注意這里
tm_wday
Day of week (0 – 6; Sunday = 0)
tm_yday
Day of year (0 – 365; January 1 = 0)
tm_isdst
Positive value if daylight saving time is in effect; 0 if daylight saving time is not in effect; negative value if status of daylight saving time is unknown. The C run-time library assumes the United States’s rules for implementing the calculation of Daylight Saving Time (DST).
Parameter
timer
Pointer to stored time
Remarks
The localtime function converts a time stored as a time_t value and stores the result in a structure of type tm. The long value timer represents the seconds elapsed since midnight (00:00:00), January 1, 1970, coordinated universal time (UTC). This value is usually obtained from the time function.
gmtime, mktime, and localtime all use a single statically allocated tm structure for the conversion. Each call to one of these routines destroys the result of the previous call.
localtime corrects for the local time zone if the user first sets the global environment variable TZ. When TZ is set, three other environment variables (_timezone, _daylight, and _tzname) are automatically set as well. See_tzset for a description of these variables. TZ is a Microsoft extension and not part of the ANSI standard definition of localtime.
Note The target environment should try to determine whether daylight saving time is in effect.
Example
http://blog.csdn.net/yiruirui0507/article/details/5841837