How to parse date string using Timezone in GWT

Has anybody succeeded parsing date string with a custom timezone in GWT? GWT's DateTimeFormat allows to format dates based on time z开发者_高级运维one, but I haven't found any method for doing opposite operation. So what should I do if I have following string "02:01:2011" (format "MM:dd:yyyy"). It can have different results in different timezones.

The other problem appears when trying to change dates, months and etc. How can I do it based on a custom timezone?

Maybe there is any library which can simplify all these operations?

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I have made workaround and add timezone part to each date string which miss that part. Still looking for a more professional solution.

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Either give the timezone to the client from the server (e.g., include it in the date string) or standardize the timezone on the server so that the client can assume a constant timezone. If you include the timezone with the date string, the below code snippet should work.

I havent tested this, but according to the docs, it should work:

String dateStr = "04/21/2011 01:37:36 -0800;
DateTimeFormat format = new DateTimeFormat("MM/dd/yyyy HH:mm:ss Z");
Date date = format.parse(dateStr);

Depending on how you are representing the timezone, you can change the final variable in the format string (the Z). See the docs for details: http://google-web-toolkit.googlecode.com/svn/javadoc/latest/com/google/gwt/i18n/client/DateTimeFormat.html

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I did the following to parse a date in the TimeZone tz. It's probably dodgy, but it works: -

final long MILLIS_IN_MINUTE = 60000;

Date localDate = DateTimeFormat.getFormat("dd MMM yyyy HH:mm:ss").parse(dateString);

int localOffset = localDate.getTimezoneOffset() * MILLIS_IN_MINUTE;
int targetOffset = tz.getOffset(localDate) * MILLIS_IN_MINUTE;

// Subtract the offset to make this into a UTC date.
return new Date(localDate.getTime() - localOffset + targetOffset);

It parses the date in the client timezone and then adjusts it to the required timezone.

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Recently I passed upon this project: gwt-calendar-class which emulates Calendar and TimeZone in javascript.

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public static Date getDateGWT(final String strDate, final int style) {
        Date date = null;
        int useStyle = style;
        if (!validStyle(style)) {
            useStyle = DEFAULT_DATE_STYLE;
        }

        if ((strDate != null) && (strDate.trim().length() > 0)) {
            DateTimeFormat df = getDateFormatGWT(useStyle);
            try {
                date = df.parse(strDate);
            } catch (Exception e) {
                date = df.parse(date.toString());
            }
        }
        return date;
    }

     private static DateTimeFormat getDateTimeFormatGWT(final int style) {
        switch(style) {
        case SHORT:
            return DateTimeFormat.getShortDateTimeFormat();
        case MEDIUM:
            return DateTimeFormat.getMediumDateTimeFormat();
        case LONG:
            return DateTimeFormat.getLongDateTimeFormat();
        case FULL:
            return DateTimeFormat.getFullDateTimeFormat();
        default :
            return DateTimeFormat.getMediumDateTimeFormat();
        }        
   }

Try This