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Yesterday, when I was trying to Install Workflow Manager via powershell I had the following issue:

Cannot validate argument on parameter ‘SBClientConfiguration’. The Service Bus connection string contains invalid property.

The thing is that when you install workflow manager with the offline web platform installer: see here
At the end of the process, the wizard will open.
There is a trick with this wizard, you cant edit the database names, and if you are like me where you share the sql instance with other development environments, then it doesnt make any sense to use those database names.
So, I tried the copy powershell commands option, and ran it.  Then it failed with the error  here.
However, I noticed then, there is a new tool installed the workflow configuration manager, and in there you have the option to create a new workflow farm, and update the DB settings
Please note this wizard is different to the wizard started at the end of the installation process, this wizard allows you more control (change DB Names)
This post helped me a bit:

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Calendar workflow in sharepoint designer, cant pull Start Time column

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After reading a few posts about this, I came to the conclussion that this is a bug in sharepoint, I can use any column to make everything I need in sharepoint designer, but when I use the start time in a workflow, it just doesnt work.

The date comes as 0001-01-01

So, I decided to give it a try to workaround, AND THIS SHOULD NOT BE THE WAY TO DO IT, MICROSOFT.

1.  Just find the current item ID, and then get the start time.

Guess what, see my workflow history list, and it works

The workaround, you can see it in the screenshot.

I must say, !LOL Microsoft!!!