lastMintDate[col] = collectionPhases[col].allowlistStartTime
                + (collectionPhases[col].timePeriod * (gencore.viewCirSupply(col) - 1));
uint256 tDiff = (block.timestamp - timeOfLastMint) / collectionPhases[col].timePeriod;
lastMintDate[col] = collectionPhases[col].allowlistStartTime + (collectionPhases[col].timePeriod * (gencore.viewCirSupply(col) - 1));
