android 時間與時區轉換

設置系統默認時區	TimeZone tz = TimeZone.getTimeZone("Asia/Shanghai"); TimeZone.setDefault(tz);
獲取系統默認時區	String str = TimeZone.getDefault().getDisplayName(); Log.e("gmx",str);
日期計算過程中 臨時時區	final Calendar now = Calendar.getInstance(); TimeZone tz = TimeZone.getTimeZone("Asia/Shanghai"); now.setTimeZone(tz);
Date2String	public static String date2String(java.util.Date date, String pattern) { SimpleDateFormat formatter = new SimpleDateFormat(pattern); String dateString = formatter.format(date); return dateString; }
Data2Timestamp	public static int date2TimeStamp(Date time) { return (int)(time.getTime()/1000); }
Timestamp2String	public static String timeStamp2String(long timeStamp) { SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String dateString = formatter.format(timeStamp * 1000); return dateString; } public static String timeStamp2String(long timeStamp, String pattern) { SimpleDateFormat formatter = new SimpleDateFormat(pattern); String dateString = formatter.format(timeStamp * 1000); return dateString; }
String2Date	public static Date string2Date(String timeStr,String pattern) { SimpleDateFormat formatter = new SimpleDateFormat(pattern); //formatter.setTimeZone(TimeZone.getTimeZone("GMT")); ParsePosition pos = new ParsePosition(0); Date result = formatter.parse(timeStr, pos); return result; } (紅色標識處表示使用自定義TimeZone而不使用系統默認，該函數可用於其它轉換方法（其它方法省略使用系統默認）)
String2Timestamp	public static int string2Timestamp(String timeStr, String pattern) { Date time = string2Date(timeStr,pattern); return (int)(time.getTime()/1000); }
get now date/time/hours minutes/seconds string ...	public static String getNowString(String pattern) { Date currentTime = new Date(); SimpleDateFormat formatter = new SimpleDateFormat(pattern); String dateString = formatter.format(currentTime); return dateString; }

 pattern: such as yyyy-MM-dd HH:mm:ss/yyyy-MM-dd/HH:mm:ss/mm:ss/mm/ss/HH ..

 備注：以上轉換均需設置為需要使用的區時。