获取当前时间分开的年,月,日

1. 获取当前月份有多少天

NSCalendar *calendar = [NSCalendarcurrentCalendar];

NSRange range = [calendarrangeOfUnit:NSDayCalendarUnitinUnit:NSMonthCalendarUnitforDate:[NSDatedate]];

NSUInteger numberOfDaysInMonth = range.length;

numberOfDaysInMonth 即为当月的天数。更多用法查看NSCalendar， NSDateComponents帮助文档

 2. 获取当前年份和月份和天数

NSCalendar *calendar = [NSCalendar currentCalendar];

unsigned unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth|NSCalendarUnitDay;

NSDateComponents *components = [calendar components:unitFlags fromDate:[NSDate date]];

NSInteger iCurYear = [components year];  //当前的年份

NSInteger iCurMonth = [components month];  //当前的月份

NSInteger iCurDay = [components day];  // 当前的号

//截取字符串  

           NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

            //设定时间格式,这里可以设置成自己需要的格式

            [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm"];

            NSString *currentDateStr = [dateFormatter stringFromDate:LHTimeView.datePicker.date];

            

            NSString *yearStr = [currentDateStr substringWithRange:NSMakeRange(0, 4)];

            NSString *monthStr = [currentDateStr substringWithRange:NSMakeRange(5, 2)];

            NSString *dayStr = [currentDateStr substringWithRange:NSMakeRange(8, 2)];

            NSString *hourStr = [currentDateStr substringWithRange:NSMakeRange(11, 2)];

            NSString *minuteStr = [currentDateStr substringWithRange:NSMakeRange(14, 2)];

            NSString *birStr = [NSString stringWithFormat:@"%@%@%@%@%@%@%@%@%@%@",yearStr,@"年",monthStr,@"月",dayStr,@"日",hourStr,@"时",minuteStr,@"分"];