Seeking help with a JavaScript API I'm new to. The response I received contains a timestamp, which seems like it's in milliseconds. I want to format this time for a countdown but I'm not sure what these milliseconds are referring to. I know how to convert milliseconds to HH/MM/SS, but the reference point is unclear to me: Milliseconds from X. I've searched everywhere and can't find an answer. Can someone please explain what these milliseconds are referring to? Thank you!
API Response:
Object
data:"[]"
deal_expiration_time:1469396377 //<------------ HERE
store_id:107645