After exporting a number of vulnerabilities to CSV format, you may notice that the "First Seen" and "Last Seen" columns are in epoch format:
"Unix time (also known as POSIX time or epoch time) is a system for describing a point in time, defined as the number of seconds that have elapsed since 00:00:00 Coordinated Universal Time (UTC), Thursday, 1 January 1970, minus the number of leap seconds that have taken place since then." – Wikipedia
Converting these times to a more human-friendly date format is easy.
Once you have opened the exported vulnerability report (in CSV format) into your spreadsheet editor (e.g. Excel)
- Create a new column, set it to a Date format, and use the following formula