Common format for time zone in Java/J2me

We are developing a j2me app for syncing contacts to/from a server. we are storing the update and create time (long mill sec) with each contact for conflict resolution/sync calculations.

Now as the client and server app can be in different time zones , how one can store time with time zone in a standard format (to take care diff time zones and daylight savings) for calculations at client and server side.

From stackoverflow

• I suggest you store all times in GMT+0 and convert the time only when you display it.

• If you use System.currentTimeMillis() you don't have to worry about time zones, because it is in universal time. From System.currentTimeMillis() Javadoc:

  public static long currentTimeMillis()

  [...]

  Returns: the difference, measured in milliseconds, between the current time and midnight, January 1, 1970 UTC.

  The time zone UTC is Coordinated Universal Time, which is mostly GMT .

  starblue : Yes, time zones (including daylight savings time) are only taken into account for presenting dates to the user.