Add giftcard expiry date to POS gift-card.liquid receipt print out

[AndreaJohnston]

I have tried to add the following <p class='gift-card-expiry'>Expires on: {{ gift_card.expires_on | date: "%d/%m/%y" }}</p> but it keeps showing as invalid date on the receipt print outs.

I find it very strange that the expiry date is not printed anywhere on the EPOS digital gift card receipts.

Has anyone managed this or can shed some light on where I am going wrong 

[Sneiv]

I've asked Shopify support several times and they keep giving me code to add to the gift card template that doesn't work.