Comment 7 for bug 1696981

@smb what I have seen is that devices lacking RTC battery tend to never had a good date in the "last mount day" date of the root filesystem, as when root is mounted the date is always near the epoch. The patch can correct this, otherwise we would be getting the date systemd was built.

Of course this is not terribly accurate, but solves issues with certificates/assertions that were deemed as not yet valid on first boot if there was no network.