(function($) {
    $.extend({
      myTime: {
        /**
         * 当前时间戳
         * @return <int>  unix时间戳(秒)
         */
        CurTime: function(){
          return Date.parse(new Date())/1000;
        },
        /**
         * 日期 转换为 Unix时间戳
         * @param <string> 2014-01-01 20:20:20 日期格式
         * @return <int>  unix时间戳(秒)
         */
        DateToUnix: function(string) {
          var f = string.split(' ', 2);
          var d = (f[0] "";
          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>