Ignore source with time before X

Hello chrony users,

For PTP we use chrony + ptp4l (timemaster) and in our lab, for
experimentation, we just use one of our switches as "grand master".
When we lose power, the switch time goes far back in time (2016) and
everything that syncs to it follows, needing some manual fixing or
reboot.

I searched the documentation and I think the answer is no, but is
there a way in chrony to ignore/exclude a source when the time is
before some date ? (we can safely put in the config than anything
before 2025/01/01 is wrong and must be ignored)

Thanks
Etienne

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