NSDate (API +时间与字符串互转)

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NSDate转换NSString

NSDate *date = [NSDate date];    NSDateFormatter *dateFor = [[NSDateFormatter alloc]init];    dateFor.dateFormat = @"yyyy/MM/dd HH:mm:ss";   //hh 12小时制   HH 24小时制    NSString *dateStr = [dateFor stringFromDate:date];

NSString转换NSDate

 NSDate *strForDate = [self stringToDate:@"2015-01-01 10:30:20" formatter:@"yyyy-MM-dd HH:mm:ss"];- (NSDate *)stringToDate:(NSString *)datetime formatter:(NSString*)format {NSDateFormatter *formatter = [[NSDateFormatter alloc] init];[formatter setFormatterBehavior:NSDateFormatterBehavior10_4];[formatter setDateFormat:format];//yyyy-MM-ddNSDate *date = [formatter dateFromString:datetime];#if !__has_feature(objc_arc)    [formatter release];#endifreturn date;}

//计算两个时间点差(以分钟为单位)

-(void)saveClickNowDate{    NSDate *date1 = [NSDate date];    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];    dateFormatter.dateFormat = @"yyyy-MM-dd HH:mm:ss";   //hh 12小时制   HH 24小时制    NSDate *date = [dateFormatter dateFromString:@"2016-12-16 00:37:20"];        [[NSUserDefaults standardUserDefaults] setObject:date forKey:@"clickDate"];    [[NSUserDefaults standardUserDefaults] setObject:date1 forKey:@"clickDate1"];    [[NSUserDefaults standardUserDefaults] synchronize];    }//取出上次点击时间，判断和现在间隔多少分钟-(BOOL)checkDate:(NSString*)timeIntrerl{    NSDate *clickDateStr = [[NSUserDefaults standardUserDefaults] objectForKey:@"clickDate"];    NSDate *clickDateStr1 = [[NSUserDefaults standardUserDefaults] objectForKey:@"clickDate1"];    NSTimeInterval time = [[NSDate date] timeIntervalSinceDate:clickDateStr];    NSTimeInterval time1 = [[NSDate date] timeIntervalSinceDate:clickDateStr1];    //    int days = ((int)time)/(3600*24);//    //    int hours = ((int)time)%(3600*24)/3600;//    //    int minutes = ((int)time)%(3600*24)%3600/60;//    //    int seconds = ((int)time)%(3600*24)%3600%60;        int timeIn = [@"5" intValue];    long long m = timeIn*60;    if ((time) >= m)    {        return YES;    }        return NO;}

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