Aussie fast food outlet Red Rooster has announced it will be giving away free chips to customers across all stores on Saturday 29 February.

And the best part? The deal comes with no strings attached.

All you have to do is rock up to your nearest Red Rooster, ask for a regular sized-serving of chips and you’re away.

The offer is in celebration of “leap day” – the extra day on the calendar that rolls around once every four years, with Red Rooster saying it was a chance to thank their customers.

“In 2020 we all get an extra day. So, head into any Red Rooster restaurant across Australia, this Saturday, February 29th and you will get free regular chips. No questions asked,” said a spokesperson.

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“We know how much everybody LOVES Red Rooster chips and we are forever grateful for our fans and customers who can’t get enough of these magical morsels of chicken salty bliss.

“We want to give back to all of them (and the rest of Australia too) with a little surprise and delight.

“We want to shout them free Reg chips to celebrate the extra day in 2020! Leap Day Chip Day!”

WHY IS THERE A LEAP DAY?

Although most modern calendar years have 365 days, a complete revolution around the sun (one solar year) takes approximately 365 days and six hours.

An extra 24 hours thus accumulates every four years, requiring that an extra calendar day be added to align the calendar with the sun’s apparent position.

Without the added day, the seasons would move back in the calendar, leading to confusion about when to undertake activities dependent on weather, ecology, or hours of daylight.

BUT IT’S NOT EXACTLY AS SIMPLE AS ALL THAT

A solar year, however, is slightly shorter than 365 days and 6 hours (365.25 days). More precisely, as derived from the Alfonsine tables, the Earth completes its orbit around the Sun in 365 days, 5 hours, 49 minutes, and 16 seconds (365.2425 days).

On these figures adding a calendar day every four years is an excess of 42 minutes and 52 seconds each time, or about three days every 400 years.