date on which those with the recognized authority have asserted that all statements in FS have been prepared and those with authority have taken responsibility for those FS.
report cannot be dated earlier than the date on which the auditor has obtained sufficient appropriate evidence on which to base the opinion of FS. cannot be earlier than the date of approval of the financial statements.
auditor has no obligation to perform any audit procedures after date of auditors report. if the fact becomes known to the auditor before issuance of FS, auditor may amend report.