Dreyfus New York Municipal Cash Management N-CSR Certified annual shareholder report (management investment company)

	[EX-99.CERT]
	Exhibit (a)(2)
SECTION 302 CERTIFICATIONS

I, Stephen E. Canter, certify that:
1.	I have reviewed this report on Form N-CSR of Dreyfus New York Municipal Cash Management;
2.	Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to
state a material fact necessary to make the statements made, in light of the circumstances under which such
statements were made, not misleading with respect to the period covered by this report;
3.	Based on my knowledge, the financial statements, and other financial information included in this report,
fairly present in all material respects the financial condition, results of operations, changes in net assets, and
cash flows (if the financial statements are required to include a statement of cash flows) of the registrant as
of, and for, the periods presented in this report;
4.	The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure
controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940) for the
registrant and have:
	(a) Designed such disclosure controls and procedures, or caused such disclosure controls and
	procedures to be designed under our supervision, to ensure that material information relating to the
	registrant, including its consolidated subsidiaries, is made known to us by others within those
	entities, particularly during the period in which this report is being prepared;
	(b) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in
	this report our conclusions about the effectiveness of the disclosure controls and procedures, as of a
	date within 90 days prior to the filing date of this report based on such evaluation; and
	(c) Disclosed in this report any change in the registrant's internal control over financial reporting that
	occurred during the registrant's most recent fiscal half-year (the registrant's second fiscal half-year in
	the case of an annual report) that has materially affected, or is reasonably likely to materially affect,
	the registrant's internal control over financial reporting; and
5.	The registrant's other certifying officer(s) and I have disclosed to the registrant's auditors and the audit
committee of the registrant's board of directors (or persons performing the equivalent functions):
	(a) All significant deficiencies and material weaknesses in the design or operation of internal control
	over financial reporting which are reasonably likely to adversely affect the registrant's ability to
	record, process, summarize, and report financial information; and
	(b) Any fraud, whether or not material, that involves management or other employees who have a
	significant role in the registrant's internal control over financial reporting.

By:	/s/ Stephen E. Canter
	Stephen E. Canter
	Chief Executive Officer
Date:	March 25, 2004

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SECTION 302 CERTIFICATIONS

I, James Windels, certify that:
1.	I have reviewed this report on Form N-CSR of Dreyfus New York Municipal Cash Management;
2.	Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to
state a material fact necessary to make the statements made, in light of the circumstances under which such
statements were made, not misleading with respect to the period covered by this report;
3.	Based on my knowledge, the financial statements, and other financial information included in this report,
fairly present in all material respects the financial condition, results of operations, changes in net assets, and
cash flows (if the financial statements are required to include a statement of cash flows) of the registrant as
of, and for, the periods presented in this report;
4.	The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure
controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940) for the
registrant and have:
	(a) Designed such disclosure controls and procedures, or caused such disclosure controls and
	procedures to be designed under our supervision, to ensure that material information relating to the
	registrant, including its consolidated subsidiaries, is made known to us by others within those
	entities, particularly during the period in which this report is being prepared;
	(b) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented
	this report our conclusions about the effectiveness of the disclosure controls and procedures, as of a
	date within 90 days prior to the filing date of this report based on such evaluation; and
	(c) Disclosed in this report any change in the registrant's internal control over financial reporting that
	occurred during the registrant's most recent fiscal half-year (the registrant's second fiscal half-year
	the case of an annual report) that has materially affected, or is reasonably likely to materially affect,
	the registrant's internal control over financial reporting; and
5.	The registrant's other certifying officer(s) and I have disclosed to the registrant's auditors and the audit
committee of the registrant's board of directors (or persons performing the equivalent functions):
	(a) All significant deficiencies and material weaknesses in the design or operation of internal control
	over financial reporting which are reasonably likely to adversely affect the registrant's ability to
	record, process, summarize, and report financial information; and
	(b) Any fraud, whether or not material, that involves management or other employees who have a
	significant role in the registrant's internal control over financial reporting.

By:	/s/ James Windels
	James Windels
	Chief Financial Officer
Date:	March 25, 2004