运用C的库函数获取当前本地时间
使用C的库函数获取当前本地时间
int tm_min; /* minutes after the hour [0-59] */
int tm_hour; /* hours since midnight [0-23] */
int tm_mday; /* day of the month [1-31] */
int tm_mon; /* months since January [0-11] */
int tm_year; /* years since 1900 */
int tm_wday; /* days since Sunday [0-6] */
int tm_yday; /* days since January 1 [0-365] */
int tm_isdst; /* Daylight Savings Time flag */
long tm_gmtoff; /* offset from CUT in seconds */
char *tm_zone; /* timezone abbreviation */
1. tm结构体
struct tm {
int tm_sec; /* seconds after the minute [0-60] */int tm_min; /* minutes after the hour [0-59] */
int tm_hour; /* hours since midnight [0-23] */
int tm_mday; /* day of the month [1-31] */
int tm_mon; /* months since January [0-11] */
int tm_year; /* years since 1900 */
int tm_wday; /* days since Sunday [0-6] */
int tm_yday; /* days since January 1 [0-365] */
int tm_isdst; /* Daylight Savings Time flag */
long tm_gmtoff; /* offset from CUT in seconds */
char *tm_zone; /* timezone abbreviation */
};
2. 使用localtime获取本地时间，具体代码如下
//获取当前时间，采用C的库函数，返回值不需要外部释放，效率方面比使用OC的NSDate类高效3-4倍
- (struct tm*)getTime
{
//时间格式
struct timeval ticks;
gettimeofday(&ticks, nil);
time_t now;
struct tm* timeNow;
time(&now);
timeNow = localtime(&now);
timeNow->tm_gmtoff = ticks.tv_usec/1000; //毫秒
timeNow->tm_year += 1900; //tm中的tm_year是从1900至今数
timeNow->tm_mon += 1; //tm_mon范围是0-11
return timeNow;
}