I use invoiced API
https://invoiced.com/docs/guides/subscription-billing
and I got records like
"renewed_last": 1493732122,
"renews_next": 1496410522,
"start_date": 1493732122,
What those magic numbers mean? I thought this is milliseconds from 1970, but it's not true. They can render data properly on their site, but I can't get date for me app. How to get date from those magic numbers?