What format Google Chrome using for cookies expire?

Question

If i export cookie from Chrome with "EditThisCookie" extension i see something like this:

{
    "domain": ".youtube.com",
    "expirationDate": 1599457462,
    "hostOnly": false,
    "httpOnly": false,
    "name": "_ga",
    "path": "/",
    "sameSite": "no_restriction",
    "secure": false,
    "session": false,
    "storeId": "0",
    "value": "GA1.2.1666271553.1536385462",
    "id": 1
}

and if i open Cookie databses (file Cookies in app folder) with DBExplorer, i see this:

expires_utc: 13243931062000000

How 13243931062000000 became 1599457462?

Answer 1

expires_utc is microseconds from 1601-01-01T00:00:00Z.

While expirationDate appears to be in Unix time, seconds from 1970-01-01T00:00:00Z.

You can find more information about expires_utc here.