问题
I'm receiving a ParseException with the following code and I can't seem to fix it:
String date = "Tue Mar 13 2012 10:48:05 GMT-0400";
SimpleDateFormat format = new SimpleDateFormat("EEE MMM dd yyyy HH:mm:ss zzzX"); //Tried zzzZ at the end as well
System.out.println(format.parse(date));
If I take out the -0400 and the X (or Z) at the end of the SimpleDateFormat things work fine, but once it's in the code, it simply doesn't work. What symbol should I be using instead? I'm using Java 7.
Here is the parse error I receive:
java.text.ParseException: Unparseable date: "Tue Mar 13 2012 10:48:05 GMT-0400"
at java.text.DateFormat.parse(DateFormat.java:357)
java.text.ParseException: Unparseable date: "Tue Mar 13 2012 10:48:05 GMT-0400"
at java.text.DateFormat.parse(DateFormat.java:357)
at com.throwaway.parse.DateParsing.testDate(TestDate:17)
回答1:
The GMT part of GMT-0400 of your string is causing the problem.
The Z (or X in java 7) parameter is only matching -4000. You have to escape GMT by using single quotes like this :
DateFormat format = new SimpleDateFormat("EEE MMM dd yyyy HH:mm:ss 'GMT'Z", Locale.US);
Note that it's also a good practice to put a Local in your DateFormat. Without it your code won't work in other countries (like here in France...).
回答2:
Three issues all dealing with mixed usage. Either:
- Use a single lower-case "z" and a ":" separating your hour and time in the time zone when using "GMT(+/-)hh:mm", or
- Use a single upper-case "Z" and drop the "GMT" from your timezone, and you can use the "(+/-)hhmm" format, or
- Use a single upper-case "X" and still drop the "GMT" but you can use any format of the hhmm zone.
From the Javadoc:
- z General time zone Pacific Standard Time; PST; GMT-08:00
- Z RFC 822 time zone -0800
- X ISO 8601 time zone -08; -0800; -08:00
回答3:
The pattern zzzz could only parse "GMT-04:00" style strings. Your example can be parsed with this pattern: EEE MMM dd yyyy HH:mm:ss Z
回答4:
use "EEE MMM dd yyyy HH:mm:ss zzzZ".zzz is for GMT and Z is for 'RFC 822 time zone' please refer
Check this out
回答5:
If you always expect your timezone to be represented that way, you could put "GMT" in single quotes in your format string to prevent it from being parsed:
EEE MMM dd yyyy HH:mm:ss 'GMT'XX
It's a bit weird that none of the built-in formats can parse it though. Perhaps the Javadoc is incorrect when it lists GMT-08:00 as an example of z?
来源：https://stackoverflow.com/questions/9703729/java-date-parsing-timezone-causing-parse-error