1. 判断两个时间的先后顺序

• (BOOL)judgeTheOntTime:(NSString *)firstString isLaterThanAnotherTime:(NSString *)Secondstring
  {
  NSDateFormatter *dateformatter = [[NSDateFormatter alloc]init];
  [dateformatter setDateFormat:@"yyyy-mm"];

  NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Asia/Shanghai"];
  [dateformatter setTimeZone:timeZone];

  NSDate *oneTime = [dateformatter dateFromString:firstString];
  NSDate *anotherTime = [dateformatter dateFromString:Secondstring];

  //第一个时间晚于第二个时间
  if ([oneTime timeIntervalSinceDate:anotherTime] > 0) {

    return YES;
  

  }else{

    return NO;
  

  }

}

2.调用两个时间进行判断
NSString *firstDate = @"2017-10";
NSString *secDate = @"2017-11";

BOOL isForer = [self judgeTheOntTime:firstDate isLaterThanAnotherTime:secDate];

if (isForer) {
    
    NSLog(@"成功，早于");
}else{
    NSLog(@"成功，晚于");

}

3.截图如下

image.png

image.png