How to find out future timestamp value in GWT?

Question

I have few timestamp format

time stamp format contains YYYY MM DD hh mm ss S AM/PM CountryName/CityName(zone)

YYYY-MM-DD HH:mm:ss.S
YYYY-MM-DD HH:mm:ss.S AM/PM
YYYY-MM-DD HH:mm:ss.S AM/PM z
YYYY-MM-DD HH:mm:ss.z 

I want to do validation on timestamp value, If time stamp value is future value (or greater than existing) then want to show.notification message to user.

For Date format I have written following code which works to check Future date

DateTimeFormat df = DateTimeFormat.getFormat(dateFormat);
        Date updateDate = df.parseStrict(newDateValue);
        Date synchronizedDate = df.parseStrict(synchronizedDB_DateValue);
        boolean isFutureDate = updateDate.after(synchronizedDate);
        if (isFutureDate ) {
           // send notification
        }
        else {
            // do nothing
        }

EDIT:

Following code only works for timestamp format = YYYY-MM-DD HH:mm:ss.S

                String timestampFormat = "YYYY-MM-DD HH:mm:ss.S"; // It works
                //String timestampFormat = "YYYY-MM-DD HH:mm:ss.S AM/PM"; 
                //String timestampFormat = "YYYY-MM-DD HH:mm:ss.S AM/PM z"
                //String timestampFormat = "YYYY-MM-DD HH:mm:ss.S z ";

                String newTimestampFormat=  timestampFormat.replaceAll("-", ".");
                newTimestampFormat = newTimestampFormat.replace("YYYY", "yyyy");
                newTimestampFormat = newTimestampFormat.replace("AM/PM", "a");

                DateTimeFormat df = DateTimeFormat.getFormat(newTimestampFormat);
                Date updateDate = df.parse(newTimeStampValue); // UPDATED VALUE = 2013.08.21 00:00:00.123

                Date synchronizedDate = df.parseStrict(synchronizedDB_DateValue); // current or old db value = 2013.07.11 00:00:00.123

                boolean isFutureTimestamp = updateDate.after(synchronizedDate);
                if (isFutureTimestamp ) {
                   // send notification
                }
                else {
                    // do nothing
                }

What changes I need to do for all other time-stamp format ?

Thanks in advance.

Answer 1

This is my solution and It Works :)

private boolean function isFutureTimestamp(){
        String gwtTimestampFormat = convertToGwtTimeStampFormat(timestampFormat); 
        // timestampFormat = YYYY-MM-DD HH:mm:ss.S AM/PM z
        // gwtTimestampFormat = yyyy.MM.dd HH:mm:ss.S a z

        DateTimeFormat df = DateTimeFormat.getFormat(gwtTimestampFormat); 

        String newlyUpdatedTimestampValue = convertToGwtTimeStampFormat(timestampValue);
        Date updatedDateTime = df.parse(newlyUpdatedTimestampValue); 

        String currentTimestamp = convertToGwtTimeStampFormat(currentTimestampValue);
        Date currentDateTime = df.parse(currentTimestamp);

        boolean isFutureTimestamp  = updatedDateTime.after(currentDateTime);
        return isFutureTimestamp;
}

  private String convertToGwtTimeStampFormat(String gwtTimestampFormat) {

        if (gwtTimestampFormat != null && gwtTimestampFormat.length() > 20) { // "2012-12-23 23:12:32.2".length= 21
            gwtTimestampFormat = gwtTimestampFormat.replace("-", ".");
            gwtTimestampFormat = gwtTimestampFormat.replace("YYYY", "yyyy");
            gwtTimestampFormat = gwtTimestampFormat.replace("DD", "dd");
            gwtTimestampFormat = gwtTimestampFormat.replace("AM/PM", "a");
            return gwtTimestampFormat;
        }
        else {
            return "";
        }
    }