If you are using CATS, You can use reports like CATS_DA or CATC
You can upload the clock in/outs from third party systems to SAP using standard reports
whats the final destination of these clock in/outs etc? with which infotype you want to do comparison etc?
In Time Management, we do have reports rptabs60,
but you might need to enhance the reports if you want to do comparison between Teven table etc