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I am working on netscape cookies extractor and reader of chromium based browsers and when i tried , i got the value in webkit timestamp (17 digit value) 13332724148415168 , need a mathematical formula or a function to convert webkit timestamp to unix timestamp.

Aman Choudhary
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  • This value doesn't appear to be a valid JavaScript timestamp value. Do you know what it represents (seconds/milliseconds/nano-seconds since what epoch)? What is a WebKit Timestamp? Do you know what time this value should represent – phuzi Jul 06 '22 at 09:47
  • FYI Chromium doesn't use WebKit but Blink (which was forked from WebKit and, incidentally, why Safari is becoming the new IE) – phuzi Jul 06 '22 at 09:53
  • check this [DateTimeOffset](https://learn.microsoft.com/en-us/dotnet/api/system.datetimeoffset?view=net-6.0). eg. `var timeStamp = DataTimeOffset.FromUnixTimeMilliseconds(time / 1000).ToUnixTimeSeconds()` – Parsa S Jul 06 '22 at 10:52

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you can write your own method like the folowing:

static long WebKitTimestampToUnixSeconds(long webkitTimestamp)
{
    const long secondsBetween19701601 = 11644473600;    //Number of seconds between 1 Jan 1970 and 1 Jan 1601

    //Divide by million to get seconds from WebKit timestamp and subtract seconds between 1 Jan 1970 and 1 Jan 1601
    return webkitTimestamp / 1000000 - secondsBetween19701601;
}

Webkit uses a timestamp of microseconds since 1 Jan 1601 while Unix uses seconds between current date and 1 Jan 1970 then you have to:

  1. Convert Webkit timestamp to seconds by dividing it by 1 million
  2. Subtract delta seconds between 1 Jan 1970 and 1 Jan 1601 (11644473600)

You can test it here: https://www.epochconverter.com/webkit

ale91
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  • For anyone that needs to convert to webkit epoch, its `(DateTimeOffset.UtcNow.ToUnixTimeSeconds() + secondsBetween19701601) * 1000000;` – denvercoder9 Sep 01 '23 at 21:55