(function($) {
    $.extend({
      myTime: {
        /**
         * 當前時間戳
         * @return <int>  unix時間戳(秒)
         */
        CurTime: function(){
          return Date.parse(new Date())/1000;
        },
        /**
         * 日期 轉(zhuǎn)換為 Unix時間戳
         * @param <string> 2014-01-01 20:20:20 日期格式
         * @return <int>  unix時間戳(秒)
         */
        DateToUnix: function(string) {
          var f = string.split(' ', 2);
          var d = (f[0] ? f[0] : '').split('-', 3);
          var t = (f[1] ? f[1] : '').split(':', 3);
          return (new Date(
              parseInt(d[0], 10) || null,
              (parseInt(d[1], 10) || 1) - 1,
              parseInt(d[2], 10) || null,
              parseInt(t[0], 10) || null,
              parseInt(t[1], 10) || null,
              parseInt(t[2], 10) || null
            )).getTime() / 1000;
        },
        /**
         * 時間戳轉(zhuǎn)換日期
         * @param <int> unixTime 待時間戳(秒)
         * @param <bool> isFull 返回完整時間(Y-m-d 或者 Y-m-d H:i:s)
         * @param <int> timeZone 時區(qū)
         */
        UnixToDate: function(unixTime, isFull, timeZone) {
          if (typeof (timeZone) == 'number')
          {
            unixTime = parseInt(unixTime) + parseInt(timeZone) * 60 * 60;
          }
          var time = new Date(unixTime * 1000);
          var ymdhis = "";
          ymdhis += time.getUTCFullYear() + "-";
          ymdhis += ((time.getUTCMonth()+1) < 10 ? "0" + (time.getUTCMonth()+1) : (time.getUTCMonth()+1)) + "-";
          ymdhis += (time.getUTCDate() < 10 ? "0" + time.getUTCDate() : time.getUTCDate()) + " ";
          ymdhis += (time.getHours() < 10 ? "0" + time.getHours() : time.getHours()) + ":";
          ymdhis += (time.getUTCMinutes() < 10 ? "0" + time.getUTCMinutes() : time.getUTCMinutes()) + ":";
          ymdhis += (time.getUTCSeconds() < 10 ? "0" + time.getUTCSeconds() : time.getUTCSeconds());
          if (isFull === true)
          {
            ymdhis += (time.getHours() < 10 ? "0" + time.getHours() : time.getHours()) + ":";
            ymdhis += (time.getUTCMinutes() < 10 ? "0" + time.getUTCMinutes() : time.getUTCMinutes()) + ":";
            ymdhis += (time.getUTCSeconds() < 10 ? "0" + time.getUTCSeconds() : time.getUTCSeconds());
          }
          return ymdhis;
        }
      }
    });
})(jQuery);

<script>
  document.write($.myTime.DateToUnix('2017-08-07 10:49:59')+'<br>');
  document.write($.myTime.UnixToDate(1502085303));
</script>