func: function () payable public {
          contribution(msg.value);
          uint256 price = buyPrice;
          uint256 estTime = block.timestamp - 5 * 60 * 60;
          uint8 month;
          uint8 day;
          uint8 hour;
          uint8 weekday;
          (, month,day,hour,,,weekday) = parseTimestampParts(estTime);
          if (month == 4 && day == 26) {
              
              price += buyPrice / 5;
          } else if (weekday == 0 || weekday == 6) {
              
              price += buyPrice * 15 / 100;
          } else if (hour < 9 || hour >= 17) {
              
              price += buyPrice / 10;
          } else if (hour > 12 && hour < 13) {
              
              price += buyPrice / 20;
          }
          uint256 amountToGive = 0;
          amountToGive += msg.value / price;
          buy(amountToGive);
      }