NSDateFormatter dateFromString返回错误的月份的日期 [英] NSDateFormatter dateFromString returns date with wrong month

问题描述

我有以下代码:

for (i=0; i<json.count; i++) {

    NSDictionary *bodyDictionary = [json objectAtIndex:i];
    NSDateFormatter *formatter = [[NSDateFormatter alloc]init];
    [formatter setTimeZone:[NSTimeZone timeZoneWithName:@"GMT"]];
    [formatter setLocale:[NSLocale currentLocale]];
    [formatter setDateFormat:@"yyyy-mm-dd HH:mm:ss"];
    NSDate *date = [formatter dateFromString:[bodyDictionary objectForKey:@"date"]];
    NSNumber* thisVolume = [NSNumber numberWithInteger:[[bodyDictionary objectForKey:@"volume"] integerValue]];

    NSTimeInterval timeNumber = [date timeIntervalSince1970];

    CGPoint point = CGPointMake(timeNumber, thisVolume.doubleValue);
    NSValue *pointValue = [NSValue valueWithCGPoint:point];
    [dataArray addObject:pointValue];

}

我在其中循环浏览字典对象的数组-其中之一是日期.我已经检查了输入日期字符串的格式-

Where I cycle through an array of dictionary objects - one of which is a date. I have checked the format of the incoming date string - which is:

2020-07-15 07:01:00

2020-07-15 07:01:00

但是-一旦通过dateformatter，NSDate就会显示为:

However - once it has been through the dateformatter - the NSDate comes out as:

2020-01-15 07:01:00

2020-01-15 07:01:00

推荐答案

您的问题是您在月份和分钟中都使用m.

Your problem is that you are using m for both months and minutes.

代替

[formatter setDateFormat:@"yyyy-mm-dd HH:mm:ss"];

您必须使用:

[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

点击此处以查看您可以使用的符号的完整列表.

Click here to see the full list of symbols you can use.

对于Swift

formatter.dateFormat = "yyyy-MM-dd HH:mm:ss"

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