Yes, on a campaign with a fixed date and time. Under Countdown → Buying, choose Only after the countdown ends for a launch, or Only until the countdown ends for an offer that closes. The shop then refuses the products the campaign covers outside that time: no button (and no size or colour choices on a variable product), no adding from a link or a block theme's buttons, and anything already in a cart is taken out before the checkout. Stock is never changed. Only a Fixed date and time campaign can do this; sale-date, per-visitor and cut-off countdowns always sell. See the documentation's Selling only while the clock allows for the details.
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Countdown Timer
Countdown timers that run to your real sale dates, on a product, across the shop, or as a cart timer at the checkout.
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