OC 时间比较方法

/**
 *  ios比较日期大小默认会比较到秒
 *
 *  @param oneDay     第一个时间
 *  @param anotherDay 第二个时间
 *
 *  @return 1 第一个时间靠后  -1 第一个时间靠前  0 两个时间相同
 */

//  入参是NSDate类型
- (int)junc_CompareOneDate:(NSDate *)oneDate withAnotherDate:(NSDate *)anotherDate
{
    NSDateFormatter *df = [[NSDateFormatter alloc]init];
    [df setDateFormat:@"dd-MM-yyyy HH:mm:ss"];
    
    NSString *oneDayStr = [df stringFromDate:oneDate];
    
    NSString *anotherDayStr = [df stringFromDate:anotherDate];
    
    NSDate *dateA = [df dateFromString:oneDayStr];
    
    NSDate *dateB = [df dateFromString:anotherDayStr];
    
    NSComparisonResult result = [dateA compare:dateB];
    
    if (result == NSOrderedAscending)
    {  // oneDate < anotherDate
        return 1;
        
    }else if (result == NSOrderedDescending)
    {  // oneDate > anotherDate
        return -1;
    }
    
    // oneDate = anotherDate
    return 0;
}

//  入参是NSString类型
- (int)junc_CompareOneDateStr:(NSString *)oneDateStr withAnotherDateStr:(NSString *)anotherDateStr
{
    NSDateFormatter *df = [[NSDateFormatter alloc]init];
    
    [df setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    
    NSDate *dateA = [[NSDate alloc]init];
    
    NSDate *dateB = [[NSDate alloc]init];
    
    dateA = [df dateFromString:oneDateStr];
    
    dateB = [df dateFromString:anotherDateStr];
    
    NSComparisonResult result = [dateA compare:dateB];
    
    if (result == NSOrderedAscending)
    {  // oneDateStr < anotherDateStr
        return 1;
        
    }else if (result == NSOrderedDescending)
    {  // oneDateStr > anotherDateStr
        return -1;
    }
    
    // oneDateStr = anotherDateStr
    return 0;
}