How to convert a datetime value to UTC (or GMT)

I have this problem.
The user should provide the following inputs:
- A date time value - i.e: 10 september 2006, 10:40 AM
- The world location to which that value refers - i.e.: Rome/Italy
I need as output, the UTC date time value:
- i.e: 10 september 2006, 8:40 AM
in this case it is two hours before because during summer time, the Italian timezone is GMT+2
And if the user enters:
- A date time value - i.e: 25 december 2006, 10:40 AM
- The world location to which that value refers - i.e.: Rome/Italy
The output should be: (UTC time)
- i.e: 25 december 2006, 9:40 AM
It only only one hour before because during winter, in italy the timezone is GMT+1
In few words I need that Java can do by itself all the calculations about the timezone and daylight saving around different places in the world, so that I can store in my DB the universal UTC time.
Can you suggest me some code or some good URLs?
Thanks in advance

I wrote this code, it works but I have still some issues.
          GregorianCalendar abroad = new GregorianCalendar(TimeZone.getTimeZone("Asia/Tokyo"));
          abroad.set(Calendar.YEAR, 2006);
          abroad.set(Calendar.MONTH, 11);
          abroad.set(Calendar.DATE, 25);
          abroad.set(Calendar.HOUR_OF_DAY, 1);
          abroad.set(Calendar.MINUTE, 0);
          abroad.set(Calendar.SECOND, 0);
          System.out.println(abroad.getTime());
        DateFormat df1 = DateFormat.getDateTimeInstance(DateFormat.FULL, DateFormat.FULL);
          df1.setTimeZone(TimeZone.getTimeZone("Asia/Tokyo"));
          System.out.println(df1.format(abroad.getTime()));
        DateFormat df2 = DateFormat.getDateTimeInstance(DateFormat.FULL, DateFormat.FULL);
          df2.setTimeZone(TimeZone.getTimeZone("America/New_York"));
          System.out.println(df2.format(abroad.getTime()));
        DateFormat df3 = DateFormat.getDateTimeInstance(DateFormat.FULL, DateFormat.FULL);
          df3.setTimeZone(TimeZone.getTimeZone("Etc/UTC"));
          System.out.println(df3.format(abroad.getTime()));          It outputs:
Sun Dec 24 17:00:00 CET 2006
luned� 25 dicembre 2006 1.00.00 JST
domenica 24 dicembre 2006 11.00.00 EST
domenica 24 dicembre 2006 16.00.00 UTCIn few words this code is able to compute any date from a specific timezone, to other timezone.
My questions are:
- Why the first output is in english ? and the other are in italian? (my OS is italian) but I didn't changed the locale in the code, so I don't understand why it outputs english text.
- When I get the date value in other timezones, I just get a "string" computed by the "format(...)" method of the DateFormat class.
But I really need to get something "numeric" for every specific value: minutes, hours, day of the month, month, year. Because this class will be used outside java and I don't need a string but something that the user will have formatted in his choosen locale setting for its website. (i think that I was not good to explain this point, i hope that someone can understand)
However thank you all :)

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Dear All,
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Bill has sshown one way to convert a date to a string and there are other methods. You need to clarify your question.
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¯\_(ツ)_/¯

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<removed_by_moderator>
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