Re-certification of what? 72-hour notices, within the residential landlord/tenant context, are only for non-payment of rent or towing of an inoperable vehicle.
And yes, they are valid even if served on a Friday.
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It's not exactly clear what question you need answered. If you received a 72-hour notice of failure to pay rent on a Friday, the time period begins the day after service (i.e., Saturday) and ends on the last day at midnight (i.e., Monday at 11:59pm). The answer also depends on how you were given the notice (which was not specified in your question).
It's not clear what you mean by the terms "received", "it", or "recertification".
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