How do I create the BST timezone specifically?
• A. First, note the pitfall that as well as being the Bangkok Standard Time timezone 6 hours east of GMT, “BST” also means “British Summer Time”. In most or all other timezones, daylight saving time is handled automatically and internally. But GMT is the reference for all other timezones, and so does not have the summertime update applied automatically. So here is the code to create a British Summer Time timezone that is offset 1 hour from GMT between two dates: import java.util.*; import java.text.*; // BST runs from last Sun in March to 4th (not last) Sun in Oct // create a BST timezone (code courtesy of Tony Dahlman). SimpleTimeZone bst_tz = new SimpleTimeZone( 0, // no offset from GMT “BST”, // individualized tz id Calendar.MARCH, -1, Calendar.SUNDAY,2*60*60*1000, // first Sun Apr 2AM Calendar.OCTOBER, 4, Calendar.SUNDAY,2*60*60*1000 // 4th Sun Oct 2AM ); // set the BST timezone as the default SimpleTimeZone.setDefault(bst_tz); // apply that TimeZone to create a Calendar object li
