NSDate (API +时间与字符串互转)

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-dd
	NSDate *date = [formatter dateFromString:datetime];
#if !__has_feature(objc_arc)
    [formatter release];
#endif
	return 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;
}