无法解析时间戳问题java.time.format.DateTimeParseException:无法在索引0处解析文本'9/25/2020，12:46:00 PM' [英] Timestamp can't be parsed Issue java.time.format.DateTimeParseException: Text '9/25/2020, 12:46:00 PM' could not be parsed at index 0

问题描述

我尝试捕获在检查网页上的时间戳记值之前和之后的时间，然后确认我的时间戳记介于这些时间之间.但是，我正在努力以一种干净的方式将String时间戳转换为可比较的格式.

I am attempting to capture the time before and after I check a timestamp value on a webpage and then confirm my timestamp falls in between those times. However, I'm struggling to convert my String timestamp into a comparable format in a clean way.

        Instant b4 = Instant.now();
                    
        //My code submites a file that then triggers the timestamp. I retrieve it as a string
        //exa string"9/25/2020, 11:03:18 AM"

        DateTimeFormatter dtf = DateTimeFormatter
                .ofPattern("MM/dd/yyyy, HH:mm:ss a")
                .withZone(ZoneId.systemDefault());
        Instant instantTimestamp = Instant.from(dtf.parse(timeStamp));

        Instant after = Instant.now();          

        if (instantTimestamp.isAfter(b4) && instantTimestamp.isBefore(after)) {
            testPass = true;
        }

        Assert.assertTrue(testPass);

我的错误:java.time.format.DateTimeParseException:无法在索引0处解析文本"9/25/2020，12:46:00 PM"

My Error: java.time.format.DateTimeParseException: Text '9/25/2020, 12:46:00 PM' could not be parsed at index 0

推荐答案

月份的格式和字符串中的值不匹配.格式为 MM ，它指定两位数字，但值为 9 ，它是一位数字.您可以将单个字母用于月，日，年，时，分，秒等，以容纳所有允许的数字位数.另外，我建议您以不区分大小写的方式对其进行解析，以便可以同时使用大写和小写(例如 AM 和 am ).

There is a mismatch in the format for the month and its value in the string. The format is MM which specifies two digits but the value is 9 which is a single digit. You can use single letters for month, day, year, hour, minute, seconds etc. to accommodate all allowable number of digits. Also, I suggest you parse it in a case-insensitive way so that upper and lower case (e.g. AM and am) both can be accommodated.

import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
import java.util.Locale;

public class Main {
    public static void main(String[] args) {
        // Given date-time string
        String dateTimeString = "9/25/2020, 12:46:00 PM";

        DateTimeFormatter dtf = new  DateTimeFormatterBuilder()
                                    .parseCaseInsensitive()
                                    .appendPattern("M/d/u, H:m:s a")
                                    .toFormatter(Locale.ENGLISH);
                                

        // Convert the given date-time string to LocalDateTime
        LocalDateTime ldt = LocalDateTime.parse(dateTimeString, dtf);
        System.out.println(ldt);
        
        //Convert to LocalDateTime Instant if required
        Instant instant=ldt.toInstant(ZoneOffset.UTC);
        System.out.println(instant);
    }
}

输出:

2020-09-25T12:46
2020-09-25T12:46:00Z

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