两种转换2021-01-01T00:00:00Z为2021-01-01 00:00:00时间格式的方式（UTC时间转为yyyy-MM-dd HH:mm:ss）

public static String UTCStringtODefaultString(String UTCString) {
        try {
            UTCString = UTCString.replace("Z", " UTC");
            SimpleDateFormat utcFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss Z");
            SimpleDateFormat defaultFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            Date date = utcFormat.parse(UTCString);
            return defaultFormat.format(date);
        } catch (ParseException pe) {
            pe.printStackTrace();
            return null;
        }
    }
    public String dealDateFormat(String oldDate) {
        Date date1;
        DateFormat df2;
        try {
            oldDate = oldDate.replace("Z", " UTC");
            DateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss Z");
            Date date = df.parse(oldDate);
            SimpleDateFormat df1 = new SimpleDateFormat("EEE MMM dd HH:mm:ss Z yyyy", Locale.UK);
            date1 = df1.parse(date.toString());
            df2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            return df2.format(date1);
        } catch (ParseException e) {
            e.printStackTrace();
            return null;
        }
    }

DateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS Z");