The dissolution date is the date on which the partnership relationship between the partners ceases to exist. In other words, the date on which the partners cease to carry on the business of the partnership. After this date, the partners will complete any unfinished work, settle any liabilities, realise any partnership assets and otherwise wind up the partnership.
The winding-up date is the date when the winding-up of the partnership is completed. The winding-up process involves the liquidation of the partnership's assets, the settlement of any outstanding debts or obligations and the distribution of any remaining assets to the partners. This is the date on which the partnership stops existing.