java.text.ParseException：无法解析的日期：“2/9/2016 10:30:00 AM (GMT-05:00) 东部时间（美国和加拿大）”

Question

I am getting exception when trying to parse this date:

"2/9/2016 10:30:00 AM (GMT-05:00) Eastern Time (US & Canada)" code

DateFormat format = new SimpleDateFormat("d/m/yyyy HH:mm:ss aaa zzz", Locale.ENGLISH); 
format.parse("2/9/2016 10:30:00 AM (GMT-05:00) Eastern Time (US & Canada)");

Answer 1

You have used m for the month which is wrong. You have to use M for the month and m for the minute.

I also recommend you use DateTimeFormatter instead of using the outdated SimpleDateFormat . Check this to learn more about the modern date/time API.

import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
import java.util.Locale;

public class Main {
    public static void main(String[] args) {
        DateTimeFormatter formatter = new DateTimeFormatterBuilder()
                .parseCaseInsensitive()
                .appendPattern("d/M/yyyy hh:mm:ss a (zzz)")
                .toFormatter(Locale.ENGLISH);
        ZonedDateTime zdt = ZonedDateTime.parse("2/9/2016 10:30:00 AM (GMT-05:00)", formatter);
        System.out.println(zdt);
    }
}

Output:

2016-09-02T10:30-05:00[GMT-05:00]

Also,

import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
import java.util.Locale;

public class Main {
    public static void main(String[] args) {
        DateTimeFormatter formatter = new DateTimeFormatterBuilder()
                .parseCaseInsensitive()
                .appendPattern("d/M/yyyy hh:mm:ss a (zzz)")
                .appendLiteral(" Eastern Time (US & Canada)")
                .toFormatter(Locale.ENGLISH);
        ZonedDateTime zdt = ZonedDateTime.parse("2/9/2016 10:30:00 AM (GMT-05:00) Eastern Time (US & Canada)",
                formatter);
        System.out.println(zdt);
        System.out.println(formatter.format(zdt));
    }
}

Output:

2016-09-02T10:30-05:00[GMT-05:00]
2/9/2016 10:30:00 AM (GMT-05:00) Eastern Time (US & Canada)

Answer 2

The date you are parsing does not match with the format,

m is for a minute, M for Month, This will works,

    DateFormat format = new SimpleDateFormat("d/M/yyyy HH:mm:ss aaa (zzz)", Locale.ENGLISH);

    format.parse("2/9/2016 10:30:00 AM (GMT)");

You can use Java SimpleDateFormat Online Tester to create format for date:2/9/2016 10:30:00 AM (GMT-05:00) Eastern Time (US & Canada).

Hope this help you,

Answer 3

java.time

Like others I recommend that you use java.time, the modern Java date and time API, for your date and time work.

    DateTimeFormatter formatter = DateTimeFormatter.ofPattern("d/M/u h:mm:ss a (OOOO)", Locale.ENGLISH);

    String stringToParse = "2/9/2016 10:30:00 AM (GMT-05:00) Eastern Time (US & Canada)";

    ParsePosition pp = new ParsePosition(0);
    TemporalAccessor parsed = formatter.parse(stringToParse, pp);
    OffsetDateTime dateTime = OffsetDateTime.from(parsed);

    System.out.println(dateTime);

Output is:

2016-09-02T10:30-05:00

Eastern Time (US & Canada) is not considered a time zone in the time zone database that Java uses, so we cannot parse this part of the string using DateTimeFormatter or SimpleDateFormat . To parse only a portion of the string I am using the DateTimeFormatter.parse method that accepts a ParsePosition . If we wanted, we might use the ParsePosition afterwards for determining how much of the string had been parsed.

What went wrong in your code?

• The reason for your ParseException is that (GMT-05:00) doesn't match zzz in the format pattern string. Or more precisely, your format pattern doesn't include the round bracket that is in the string to be parsed.
• As others have said, you need uppercase M for month in the format pattern. Lowercase m is for minute. This would cause an incorrect result. While SimpleDateFormat ought to throw an exception on the grounds of this error alone, it does not.
• You finally need lower case h or hh for hour within AM or PM from 01 through 12. Upper case HH is for hour of day from 00 through 23.

Link

Oracle tutorial: Date Time explaining how to use java.time.