Day One Biopharmaceuticals (DAWN) 10-Q 2022 Q3 Quarterly report

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Charles N. York II, ChiefFinancial Officer of Day One Biopharmaceuticals, Inc. (the “Company”), do hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

1. the Quarterly Report on Form 10-Q of the Company for the fiscal quarter ended September 30, 2022 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

2. the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated: November 7, 2022	/s/	Charles N. York II, M.B.A.
	Charles N. York II, M.B.A.
	Chief Operating Officer and Chief Financial Officer
	(Principal Financial Officer and Principal Accounting Officer)