objective-C日期相关操作

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1、获取当前日期、时间

NSDate *currentDate = [NSDate date];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"YYYY-MM-dd"];
NSString *currentDateStr = [dateFormatter stringFromDate:currentDate];

2、获取一周前的日期、时间

NSDate * date = [NSDate date];
NSDateFormatter * dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd"];
//一周的秒数
NSTimeInterval time = 7 * 24 * 60 * 60;
//下周就把"-"去掉
NSDate *lastWeek = [date dateByAddingTimeInterval:-time];
NSString *startDate = [dateFormatter stringFromDate:lastWeek];

3、比较两个日期大小

-(NSInteger)compareDate:(NSString*)startDate withDate:(NSString*)endDate{

NSInteger comparisonResult;
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyy-MM-dd"];
NSDate *date1 = [[NSDate alloc] init];
NSDate *date2 = [[NSDate alloc] init];
date1 = [formatter dateFromString:startDate];
date2 = [formatter dateFromString:endDate];
NSComparisonResult result = [date1 compare:date2];
NSLog(@"result==%ld",(long)result);
switch (result)
{
//date02比date01大
case NSOrderedAscending:
comparisonResult = 1;
break;
//date02比date01小
case NSOrderedDescending:
comparisonResult = -1;
break;
//date02=date01
case NSOrderedSame:
comparisonResult = 0;
break;
default:
NSLog(@"erorr dates %@, %@", date1, date2);
break;
}
return comparisonResult;
}

//与当前日期对比( 作为NSString + Extension)
-(NSInteger)compareWithCurrentDate {

if (self.length != 8) {
RFLog(@"传入的格式错误！");
return 1000;//本地自定义的错误码
}

NSInteger comparisonResult;
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyyMMdd"];
NSDate *date1 = [[NSDate alloc] init];
NSDate *date2 = [NSDate date];
date1 = [formatter dateFromString:self];
NSComparisonResult result = [date1 compare:date2];
switch (result)
{
//date2比date1大
case NSOrderedAscending:
comparisonResult = 1;
break;
//date2比date1小
case NSOrderedDescending:
comparisonResult = -1;
break;
//date2=date1
case NSOrderedSame:
comparisonResult = 0;
break;
default:
NSLog(@"erorr dates %@, %@", date1, date2);
break;
}
return comparisonResult;
}

4、比较日期差
-(NSInteger)compare:(NSDate *)startTime to:(NSDate *)endTime{

// 当前日历
NSCalendar *calendar = [NSCalendar currentCalendar];
// 需要对比的时间数据
NSCalendarUnit unit = NSCalendarUnitYear | NSCalendarUnitMonth
| NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;
// 对比时间差
NSDateComponents *dateCom = [calendar components:unit fromDate:startTime toDate:endTime options:0];
NSString *time = [NSString stringWithFormat:@"%ld%ld%ld%ld%ld%ld",dateCom.year,dateCom.month,dateCom.day,dateCom.hour,dateCom.minute,dateCom.second];
NSLog(@"time---->%@",time);
return [time integerValue];
}

5、时间和时间戳的转换

NSDate* date1 = [NSDate date];
NSTimeInterval time1 =[date1 timeIntervalSince1970];
NSString *timeString = [NSString stringWithFormat:@"%.0f",time1];
NSLog(@"系统时间戳:%@",timeString);
//时间戳转换成时间
NSTimeInterval time2 =[timeString doubleValue];
NSDate *date2 = [NSDate dateWithTimeIntervalSince1970:time2];
NSLog(@"date2 = %@",date2);
NSDateFormatter *formatter = [[NSDateFormatter alloc]init];
[formatter setDateFormat:@"yyyy/MM/dd"];
NSString *currentTime = [formatter stringFromDate:date2];
NSLog(@"当前时间:%@",currentTime);
//时间转时间戳
NSString *timeStr = [NSString stringWithFormat:@"%.0f",[date2 timeIntervalSince1970]];
NSLog(@"时间戳：%@",timeStr);

转载
文／来宝（简书作者）
原文链接：http://www.jianshu.com/p/23f9c6a0e8f2
著作权归作者所有，转载请联系作者获得授权，并标注“简书作者”。

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