java实现本地时间和格林威治时间互换

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 public static String getUTCTimeByLocalTime(String localDate, String format) {Calendar cal = Calendar.getInstance();// 获得时区和 GMT-0 的时间差,偏移量int offset = cal.get(Calendar.ZONE_OFFSET);// 获得夏令时 时差int dstoff = cal.get(Calendar.DST_OFFSET);Date date = new Date(getMillSecond(format, localDate) - (offset + dstoff));// 获得当前是UTC时区的时间毫秒值String formatDate = format(date, format);return formatDate;}public static String getLocalTimeByUTCTime(String utcDate, String format) {Calendar cal = Calendar.getInstance();// 获得时区和 GMT-0 的时间差,偏移量int offset = cal.get(Calendar.ZONE_OFFSET);// 获得夏令时 时差int dstoff = cal.get(Calendar.DST_OFFSET);Date date = new Date(getMillSecond(format, utcDate) + (offset + dstoff));// 获得当前是UTC时区的时间毫秒值String formatDate = format(date, format);return formatDate;}public static long getMillSecond(String format, String time) {Date parse = parse(time, format);return parse.getTime();}public static Date parse(String strDate, String pattern) {SimpleDateFormat df = new SimpleDateFormat(pattern);try {return df.parse(strDate);} catch (Exception e) {e.printStackTrace();return null;}}

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