issue in running workflow container operation

Hi All,

In work item, i have created  given latest end, and in this latest end outcome branch, i am changing the dead line date in container operation.

Issue is by mistake i have given wrong format of date as in screen shot. I have corrected error later, but there are few workflows in production which started before transport and those are in error.

I tried restarting those work flow, but still they are going in error again.

Please suggest how to process errored workflows.

Thanks in advance.