joda datetime处理首字母缩略词和显式时区

Question

I'm using this pattern to try and handle a datetime submission from a client:

E MMM dd yyyy HH:mm:ss 'GMT'Z (z)

and this works for me on my local ubuntu machine. A friend of mine tried submitting a form from his windows machine which produced

Wed Jun 24 2015 13:34:22 GMT-0500 (Central Daylight Time)

as the timestamp. This is obviously different than the pattern that I have - but I need to be able to handle the formatting above AND accomodate for dates like this on my ubuntu machine:

Wed Jun 24 2015 13:42:03 GMT-0500 (CDT)

how can I handle this in a pattern using jodatime?

EDIT:

Here is the form I am using in the Playframework - it might be relevant.

  val form  = Form(mapping(
    "beginDate" -> jodaDate("E MMM dd yyyy HH:mm:ss 'GMT'Z (z)"),
    "endDate" -> jodaDate("E MMM dd yyyy HH:mm:ss 'GMT'Z (z)")) )

Answer 1

The stringified version of the JavaScript date object ( Date.prototype.toString ) is implementation dependent, can vary greatly, and shouldn't be used.

The most robust way is to return the Coordinated Universal Time (UTC) from the client side. This will not have any timezone issue either. Replace the following:

new Date()

with:

new Date().getTime();    

(see this SO thread for more about that line).

Then you can take in the epoch as a Long:

val form  = Form(mapping(
  "beginDate" -> longNumber,
  "endDate" -> longNumber
)

You can add verifying to verify it if you like, for example:

... longNumber.verifying("Invalid date", _ > DateTime.now().minusYears(2).getMillis)

Then in your bindFromRequest (or wherever it is you're taking in the data), you can do the following:

new DateTime(data.beginDate)

which'll produce the DateTime that you want.

It should all then be perfect whether your friend is in Tokyo or New York. :)

Answer 2

You can use DateTimeFormatterBuilder for building a parser using aggregated formats. If one fails, it tries to parse it with the next one.

Answer 3

You could use Apache DateUtils Parsedate method -

https://commons.apache.org/proper/commons-lang/javadocs/api-2.6/org/apache/commons/lang/time/DateUtils.html#parseDate%28java.lang.String,%20java.lang.String[]%29

To format date we need to have a fair idea of the format it would come in. So parseDate with a list of patterns can be used to format a date to a string.