The plugin action only takes a list of dates (these include your time), runs some javascript to convert all the dates to a date of your choice, without affecting the hours and minutes. Then it outputs the new list as a list of dates. The plugin itself will not make changes to your data, simply put no plugin can do that.

So what you do is create an API workflow that takes a single stop as a parameter, then add 2 actions. My plugin action (which will convert the Stop’s current list of dates) and Make changes to a Thing (this will change a Stop ). In the fields to change your Times field (which I assume so far is a list of Dates) and set list to “Result of Step X’s new list” (this points to my action’s plugin.

To edit multiple stops you use a Schedule API WF on a list action from wherever.