Is testimony valid if one witness testifies the acknowledgment of the power of attorney occurred on Friday and another on Saturday?

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The testimony is complete if one witness testifies that the acknowledgment of the power of attorney occurred on Friday, and another testifies it occurred on Saturday. This is because both acknowledgments refer back to a single underlying contract (the power of attorney). It is difficult to gather witnesses at one single moment for the acknowledgment, thus accepting the acknowledgment before each witness separately is permissible.