Android系统。如何让TimeZone看起来像GMT-0X：00？

Question

如何输出“GMT -0X：00”（X - 数字）“？

Answer 1

Calendar cal = Calendar.getInstance(locale);
// or Calendar cal = Calendar.getInstance(timezone);
int zoneOffset = cal.get(Calendar.ZONE_OFFSET);

// eg: "-0700"
String timezoneStr = new SimpleDateFormat("Z").format( cal.getTime() );