There are several Active Directory attributes where the value is stored as an Integer8 value.
Here’s information on what Integer8 is:
Many attributes in Active Directory have a data type (syntax) called Integer8. These 64-bit numbers (8 bytes) often represent time in 100-nanosecond intervals. If the Integer8 attribute is a date, the value represents the number of 100-nanosecond intervals since 12:00 AM January 1, 1601. Any leap seconds are ignored.
In .NET Framework (and PowerShell) these 100-nanosecond intervals are called ticks, equal to one ten-millionth of a second. There are 10,000 ticks per millisecond. In addition, .NET Framework and PowerShell DateTime values represent dates as the number of ticks since 12:00 AM January 1, 0001.
Quick PowerShell code for converting Integer8 into a date/time value:
$Integer8 = “130567517440984934”