本文主要是介绍NSDate 的一些操作(比较、创建、在现有date加减一定时间等),希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
创建当前时间
NSDate *date = [NSDate date];
从现在开始的24小时
NSTimeInterval a_day = 24*60*60;
NSDate *tomorrow = [NSDate dateWithTimeIntervalSinceNow:a_day];
根据已有日期创建日期
NSTimeInterval a_day = 24*60*60;NSDate *date = [NSDate date];NSDate *tomorrow = [date addTimeInterval: date];
日期比较
BOOL isEqual = [date isEqualToDate:tomorrow];if(isEqual){NSLog(@"equal");}
//获取较早的日期
NSDate *earlier_date = [tomorrow earlierDate:date];NSLog(@"earlierDate = %@",earlierDate);
//较晚的日期
NSDate *laterDate = [tomorrow laterDate:date];NSLog(@"laterDate = %@",laterDate);
//两个日期之间相隔多少秒
NSTimeInterval secondsInterval= [date timeIntervalSinceDate:tomorrow];NSLog(@"secondsInterval= %lf",secondsInterval);
//通过NSCalendar类来创建日期
NSDateComponents *comps = [[NSDateComponentsalloc]init];[comps setMonth:01];[comps setDay:31];[comps setYear:2013];NSCalendar *calendar = [[NSCalendaralloc]initWithCalendarIdentifier:NSGregorianCalendar];NSDate *date = [calendar dateFromComponents:comps];
//从已有日期获取日期
unsigned units = NSMonthCalendarUnit|NSDayCalendarUnit|NSYearCalendarUnit;NSDateComponents *_comps = [calendar components:units fromDate:date];NSInteger month = [_comps month];NSInteger year = [_comps year];NSInteger day = [_comps day];//NSDateFormatter实现日期的输出NSDateFormatter *formatter = [[NSDateFormatteralloc]init];[formatter setDateStyle:NSDateFormatterFullStyle];//直接输出的话是机器码//或者是手动设置样式[formatter setDateFormat:@"yyyy-mm-dd"];NSString *dateString = [formatter stringFromDate:date];NSLog(@"dateString = %@",dateString);NSLog(@"formater = %@",formatter);
//获取日期格式对象
- (NSDateFormatter *)getDateFormatter {if (dateFormatter == nil) {dateFormatter = [[NSDateFormatter alloc] init];[dateFormatter setDateStyle:NSDateFormatterMediumStyle];[dateFormatter setTimeStyle:NSDateFormatterNoStyle];}return dateFormatter;
}
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