获取年月日

1.关于日期的处理

获取前几天的时间,提取月日

NSArray *dayArry=@[@1,@2,@3,@4,@5,@6,@7];

NSDate*nowDate = [NSDate date];

NSDate* theDate;

for (NSNumber *days in dayArry ) {

NSInteger day=[days integerValue];

if (day!=0) {

NSTimeInterval  oneDay = 24*60*60*1;  //1天的长度

theDate = [nowDate initWithTimeIntervalSinceNow: -oneDay*day ];

}

else{

theDate = nowDate;

}

NSLog(@"%@",theDate);

NSCalendar *calendar = [NSCalendar currentCalendar];

NSRange range = [calendar rangeOfUnit:NSDayCalendarUnit inUnit:NSMonthCalendarUnit forDate:theDate];

NSUInteger numberOfDaysInMonth = range.length;

NSLog(@"%lu", (unsigned long)numberOfDaysInMonth);

unsigned unitFlags = NSYearCalendarUnit |NSMonthCalendarUnit |NSDayCalendarUnit;

NSDateComponents *components = [calendar components:unitFlags fromDate:theDate];

NSLog(@"%ld, %ld, %ld", (long)components.year, (long)components.month, (long)components.day);

NSString *dayString=[NSString stringWithFormat:@"%ld-%ld",(long)components.month,(long)components.day];

[self.LCView.xValues insertObject:dayString atIndex:0];

2.时间间隔

- (NSString *) compareCurrentTime:(NSString *)str

{

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

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

NSDate *d=[date dateFromString:str];

NSTimeInterval late=[d timeIntervalSince1970]*1;

NSDate* dat = [NSDate dateWithTimeIntervalSinceNow:0];

NSTimeInterval now=[dat timeIntervalSince1970]*1;

NSString *timeString=@"";

NSTimeInterval cha=late-now;

NSLog(@"%f",cha);

if (cha/3600<1) {

timeString = [NSString stringWithFormat:@"%f", cha/60];

timeString = [timeString substringToIndex:timeString.length-7];

timeString=[NSString stringWithFormat:@"%@分", timeString];

}

if (cha/3600>1&&cha/86400<1) {

timeString = [NSString stringWithFormat:@"%f", cha/3600];

timeString = [timeString substringToIndex:timeString.length-7];

timeString=[NSString stringWithFormat:@"%@小时", timeString];

}

if (cha/86400>1)

{

timeString = [NSString stringWithFormat:@"%.f",ceilf(cha/86400.0)+1];

//        timeString = [timeString substringToIndex:timeString.length-7];

timeString=[NSString stringWithFormat:@"%@", timeString];

}

else{

timeString=@"1";

}

NSString *timeString=[NSString stringWithFormat:@"%ld",[self getMondays:str]];

NSLog(@"%@",timeString);

return  timeString;

}