IOS 时间 日历 处理集合
1.获得当前时间 从1970开始的秒数
NSTimeInterval time = [[NSDate date[ timeIntervalSince1970]];
NSString * str = [NSString stringWithFormat:@"%lf",(long long int )time];
2.两个时间比较
NSTimeInterval secondsInterval= [date timeIntervalSinceDate:tomorrow];
3.得到年月日
NSDate * date = [NSDate date];
NSCalendar * calen = [NSCalendar currentCalendar];
NSUInteger flag = NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute;
NSDateComponents * dateCom = [calen components:flag fromDate:date];
int hour = [dateCom hour];
int day = [dateCom day];
int min = [dateCom minute];