Availability Group how to determine last Failover time I'd just like to know if there is any way to query when the AG group failed over.

eg - this is the Primary Replica now, but I'm pretty sure it was the secondary yesterday?  How can i find when the failover took place  

is there something specific in the Logs I should be looking for, or is there a tsql script to use?
You can use following PowerShell script to get last failover time

    Get-winEvent -ComputerName ListnerName -filterHashTable @{logname ='Microsoft-Windows-FailoverClustering/Operational'; id=1641}| ft -AutoSize -Wrap