How do I convert milliseconds into a timestamp?

I took this piece from an unencrypted .DAT file:

Code:

---

00 e1 27 17 6f e6 69 c0

---

Which translates to 63,374,851,375,000,000 in decimal. This number is definitely microseconds.

And this huge number cannot bypass the 1st January 1970 00:00:00 format; such a format that most converters use today.

So, yes. Is there such a converter that uses the 1st January of the year 1 format? Or how shall I make one?

And by the way, a timestamp is both date and time.

EDIT- Sorry, it's microseconds, not milliseconds.

Thanks in advance!

finally fixed it...

Code:

---

private void generate(object sender, EventArgs e)
        {
            String dateString = yyyy.Text + dd.Text + MM.Text + hh.Text + Mi.Text + ss.Text;
            DateTime timestamp;
            if (!DateTime.TryParseExact(dateString, "yyyyddMMHHmmss", null,
                                      DateTimeStyles.None, out timestamp ))
            return;
            long ticks = timestamp.Ticks;
            long microseconds = ticks / 10;
            convertedText.Text = microseconds.ToString("X");
        }

---