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/******* 设置两个时间差为固定值 *******/
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian]; NSDate *currentDate = [NSDate date]; NSDateComponents *comps = [[NSDateComponents alloc] init]; [comps setDay:1];//设置最大时间为：当前时间推后1天 NSDate *maxDate = [calendar dateByAddingComponents:comps toDate:currentDate options:0]; NSDateFormatter *formater = [[NSDateFormatter alloc] init]; formater.dateFormat = @"yyyy-MM-dd HH:mm";
/******* 日期可以进行比较以确定大小或相等，也可以确定两个日期之间的时间间隔。两个日期的间隔时间差可以使用-timeIntervalSinceDate:方法来计算 *******/
NSDate * now = [NSDatedate]; NSDate * anHourAgo = [nowdateByAddingTimeInterval:-60*60]; NSTimeInterval timeBetween = [nowtimeIntervalSinceDate:anHourAgo]; NSLog(@"%f",timeBetween);//结果：3600.000000
/******* 日期比较也可以使用-timeIntervalSinceNow方法获取和当前的时间间隔 *********/
NSDate * anHourago = [NSDatedateWithTimeIntervalSinceNow:-60*60]; NSTimeInterval interval = [anHouragotimeIntervalSinceNow]; NSLog(@"%f",interval);//结果： -3600.000007
/**** iOS比较日期大小默认会比较到秒 ****/ +(int)compareOneDay:(NSDate *)oneDay withAnotherDay:(NSDate *)anotherDay { NSDateFormatter *dateFormatter = [[NSDateFormatteralloc]init]; [dateFormatter setDateFormat:@"dd-MM-yyyy"]; NSString *oneDayStr = [dateFormatter stringFromDate:oneDay]; NSString *anotherDayStr = [dateFormatter stringFromDate:anotherDay]; NSDate *dateA = [dateFormatter dateFromString:oneDayStr]; NSDate *dateB = [dateFormatter dateFromString:anotherDayStr]; NSComparisonResult result = [dateA compare:dateB]; NSLog(@"date1 : %@, date2 : %@", oneDay, anotherDay); if (result == NSOrderedDescending) { //NSLog(@"Date1 is in the future"); return 1; } else if (result ==NSOrderedAscending){ //NSLog(@"Date1 is in the past"); return -1; } //NSLog(@"Both dates are the same"); return 0;
} /************ 日期格式请传入：2013-08-05 12:12:12；如果修改日期格式，比如：2013-08-05，则将[df setDateFormat:@"yyyy-MM-dd HH:mm:ss"];修改为[df setDateFormat:@"yyyy-MM-dd"]; ***********/ +(int)compareDate:(NSString*)date01 withDate:(NSString*)date02{ int ci; NSDateFormatter *df = [[NSDateFormatteralloc]init]; [df setDateFormat:@"yyyy-MM-dd HH:mm:ss"]; NSDate *dt1 = [[NSDatealloc]init]; NSDate *dt2 = [[NSDatealloc]init]; dt1 = [df dateFromString:date01]; dt2 = [df dateFromString:date02]; NSComparisonResult result = [dt1 compare:dt2]; switch (result) { //date02比date01大 caseNSOrderedAscending: ci=1;break; //date02比date01小 caseNSOrderedDescending: ci=-1;break; //date02=date01 case NSOrderedSame: ci=0;break; default: NSLog(@"erorr dates %@, %@", dt2, dt1);break; } return ci; } /********* 比较两个日期之间的差值 *******/ + (instancetype)differencewithDate:(NSString*)dateString withDate:(NSString*)anotherdateString{ { // _created_at == Thu Oct 16 17:06:25 +0800 2014 // dateFormat == EEE MMM dd HH:mm:ss Z yyyy // NSString --> NSDate NSDateFormatter *fmt = [[NSDateFormatteralloc]init]; // 如果是真机调试，转换这种欧美时间，需要设置locale fmt.locale = [[NSLocalealloc]initWithLocaleIdentifier:@"en_US"];
// 设置日期格式（声明字符串里面每个数字和单词的含义）
// E:星期几 // M:月份 // d:几号(这个月的第几天) // H:24小时制的小时 // m:分钟 // s:秒 // y:年 fmt.dateFormat =@"EEE MMM dd HH:mm:ss Z yyyy";
// 微博的创建日期 NSDate *createDate = [fmt dateFromString:dateString]; // 当前时间 NSDate *now = [NSDatedate]; // 日历对象（方便比较两个日期之间的差距） NSCalendar *calendar = [NSCalendarcurrentCalendar]; // NSCalendarUnit枚举代表想获得哪些差值 NSCalendarUnit unit =NSCalendarUnitYear |NSCalendarUnitMonth |NSCalendarUnitDay |NSCalendarUnitHour |NSCalendarUnitMinute |NSCalendarUnitSecond; // 计算两个日期之间的差值 NSDateComponents *cmps = [calendar components:unit fromDate:createDate toDate:now options:0];
NSLog(@"%@ %@ %@", createDate, now, cmps);
return cmps; }
/********* 比较两个日期之间某年或某月或某日或某时等的具体差值 *******/ + (instancetype)differencewithDate:(NSString*)dateString withDate:(NSString*)anotherdateString{ {
NSDateFormatter * formatter = [[NSDateFormatteralloc]init]; // [formatter setDateFormat: @"yyyy-MM-dd HH:mm:ss"]; [formatter setDateFormat:@"yyyy-MM-dd "]; NSDate *date2 = [formatterdateFromString :dateString]; NSDate *date1 = [formatterdateFromString :anotherdateString]; // NSLog(@"------date1=%@ date2=%@------%@",date1, date2); NSCalendar *gregorian = [[NSCalendaralloc]initWithCalendarIdentifier:NSGregorianCalendar]; unsignedint unitFlags =NSMonthCalendarUnit;//年、月、日、时、分、秒、周等等都可以 NSDateComponents *comps = [gregoriancomponents:unitFlagsfromDate:date1 toDate:date2options:0]; int month = [compsmonth];//时间差 NSLog(@"时间差 = %d，abs(month)=%d",month,abs(month)); return month; } |
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