本地時間轉UTC時間

//    yyyy-MM-dd HH:mm:ss  東八區 +8
public static String parseStringToUtc(String string) {
String myTime = "";
    if (TextUtils.isEmpty(string)) {
return myTime;
} else {
String Ymd = string.split(" ")[0];
String Hms = string.split(" ")[1];
        int newHour = Integer.valueOf(Hms.split(":"
 
)[0]) + 8;
// 假如  小於 24的時候 正常顯示  大於24 則 天數加1
if (newHour < 24) {
if (Hms.split(":").length == 3) {
                myTime = Ymd + "T" + newHour + ":" + Hms.split(":")[1] + ":" + Hms.split(":")[2]+"Z";
} else if (Hms.split(":").length == 2) {
                myTime = Ymd + "T" + newHour + ":" + Hms.split
 
(":")[1] + ":00Z";
} else if (Hms.split(":").length == 1) {
                myTime = Ymd + "T" + newHour + ":00:00Z";
}
return myTime;
} else {
try {
                newHour = newHour - 24;
Date date = (new SimpleDateFormat("yyyy-MM-dd")).parse(Ymd);
Calendar cal = Calendar.getInstance();
cal.setTime(date)
 
;
cal.add(Calendar.DATE, 1);
Ymd = new SimpleDateFormat("yyyy-MM-dd").format(cal.getTime());
myTime = Ymd + "T" + newHour + ":";
                if (Hms.split(":").length == 1) {
return myTime + "00:00Z";
} else if (Hms.split(":").length == 2) {
return myTime + Hms.split(":")[1] + ":00Z";
} else if (Hms.split(":").length == 3) {
return myTime + Hms.split(":")[1] + ":" + Hms.split(":")[2] + "Z";
} else {
return "";
}
            } catch (ParseException e) {
Log.e("error", "parseStringToUtc解析異常");
                return "";
}
        }
    }
}

UTC時間轉本地時間

public static Date parseUTCtoDate(String str) {
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
df.setTimeZone(TimeZone.getTimeZone("UTC"));
    try {
return df.parse(str);
} catch (Exception e) {
Log.e("error", "DateUtil:" + e.toString());
        return new Date(0);
}
}