Is it legal to sell gift cards that won't be valid for over a month?

I just bought gift cards from a small privately owned chain restaurant. They were doing a Black Friday promotion- for every $30 worth, get an extra $10 in "bucks" (like money that can only be used at the restaurant). I purchased $120 gift card, with the intention of using part of the gift card for take out. They told me the gift card wouldn't be valid until the new year! If I had known that, I wouldn't have bought so much, probably half the amount- never had that happen at another restaurant. I have found info on the web stating that a gift card can't expire for 7 years, but can't find any info about if they can delay when the gift card is valid. It didn't say anything about that part in the mailer they sent me, on their website, or in person- only after I purchased and tried to pay with it at the take out window. Anyone know if this is legal? And if not, where there is a link stating so? This is in Massachusetts, if it makes a difference.