When completing a schedule, the date to be inserted must be the execution date of the document that the schedule forms a part of. Do not use the date that the schedule was signed unless, of course, this happens to be the very same date.
The reason for this rule lies in the purpose behind the wording at the bottom of the schedule: this wording, including the date, is required so as to identify the document that the schedule forms a part of and the inclusion of the date of that document will make that process more certain.
The date of a document is the date on which the document was executed and not the date that any supporting evidence was signed (such as The Farmlands Ownership Act evidence or The Tax Administration and Miscellaneous Taxes Act evidence). Where multiple parties have executed a document, the date of the document is the date that the last person executed the document.