localtime函数
功能：
把从1970-1-1零点零分到当前时间系统所偏移的秒数时间转换为本地时间，而gmtime函数转换后的时间没有经过时区变换，是UTC时间 。
用法：
#include <time.h>
struct tm *localtimeconst time_t *clock);
返回值：
指向tm 结构体的指针， tm结构体是time.h中定义的用于分别存储时间的各个量年月日等)的结构体.
strftime函数
功能：
根据区域设置，格式化本地时间/日期，功能就是将时间格式化
用法：
#include <time.h>
size_t strftimechar * strDest, size_t maxszie, const char * format, const struct tm* timeptr);
示例如下：
#include <stdio.h>
#include <unistd.h>
#include <time.h>
int mainvoid)
{
char ct[80];
time_t tt;
struct tm *tblock;
tt = timeNULL);
tblock = localtime&tt);
printf”Local time is %s\n”, asctimetblock));
strftimect, sizeofct), “%Y-%m-%d %H:%M:%S”, tblock);
printf”now is %s\n”, ct);
return 0;
}
结果：
备注：
strftime函数常使用的formate参数：
specifierReplaced byExample%aAbbreviated weekday name *Thu%AFull weekday name *Thursday%bAbbreviated month name *Aug%BFull month name *August%cDate and time representation *Thu Aug 23 14:55:02 2001%dDay of the month 01-31)23%HHour in 24h format 00-23)14%IHour in 12h format 01-12)02%jDay of the year 001-366)235%mMonth as a decimal number 01-12)08%MMinute 00-59)55%pAM or PM designationPM%SSecond 00-61)02%UWeek number with the first Sunday as the first day of week one 00-53)33%wWeekday as a decimal number with Sunday as 0 0-6)4%WWeek number with the first Monday as the first day of week one 00-53)34%xDate representation *08/23/01%XTime representation *14:55:02%yYear, last two digits 00-99)01%YYear2001%ZTimezone name or abbreviationCDT%%A % sign%
转载于:https://www.cnblogs.com/rohens-hbg/p/7921344.html