EXHIBIT 12.1


                       Certifications of the CEO and CFO
          Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
          ---------------------------------------------------------

I, Nigel Stokes, certify that:

1.   I have reviewed this annual report on Form 20-F of DataMirror
     Corporation;

2.   Based on my knowledge, this annual 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 annual report;

3.   Based on my knowledge, the financial statements, and other financial
     information included in this annual report, fairly present in all
     material respects the financial condition, results of operations and cash
     flows of the registrant as of, and for, the periods presented in this
     annual report;

4.   The registrant's other certifying officer and I are responsible for
     establishing and maintaining disclosure controls and procedures (as
     defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) 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 annual 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 the
         end of the period covered by this annual report based on such
         evaluation; and

     (c) Disclosed in this annual report any change in the registrant's
         internal control over financial reporting that occurred during the
         period covered by the 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 and I have disclosed, based on
     our most recent evaluation of internal control over financial reporting,
     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.

Date:  June 1, 2004

By: /s/Nigel Stokes
    -----------------------
    Nigel Stokes
    Chief Executive Officer



I, Peter Cauley, certify that:

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1.   I have reviewed this annual report on Form 20-F of DataMirror
     Corporation;

2.   Based on my knowledge, this annual 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 annual report;

3.   Based on my knowledge, the financial statements, and other financial
     information included in this annual report, fairly present in all
     material respects the financial condition, results of operations and cash
     flows of the registrant as of, and for, the periods presented in this
     annual report;

4.   The registrant's other certifying officer and I are responsible for
     establishing and maintaining disclosure controls and procedures (as
     defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) 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 annual 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 the
         end of the period covered by this annual report based on such
         evaluation; and

     (c) Disclosed in this annual report any change in the registrant's
         internal control over financial reporting that occurred during the
         period covered by the 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 and I have disclosed, based on
     our most recent evaluation of internal control over financial reporting,
     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.


Date:  June 1, 2004

By: /s/Peter Cauley
    -----------------------
    Peter Cauley
    Chief Financial Officer