This reverts commit e404f1038f461264f9395742ef74f5b710bef54a.

The commit above introduced the Epoch type to reduce the need for depending on the localtime crate. Eventually, node operators noticed that announcements would appear to be in the future and cause connection issues.

After more research, an issue¹ was found that describes how on some platforms, primarily Linux and MacOS, Instant::duration_since would return a shortened duration. This is the cause of this apparent drift in time.