X-Last-Upgrade-Date (wpkg-status)

Quick Info
Generated*
wpkg-status
Date

The X-Last-Upgrade-Date field is saved in the wpkg-status file whenever a package is being upgraded. The value is not set if you are installing a package for the first time. This gives you a way to know whether a package was ever upgraded.

The date is written using the RFC-2822 format as defined for the Date field by Debian.