Input: date format

[stephanritscher]

In order to be compatible with other plugins, the date format of the values in the data object id should be configurable.

I'm using iobroker.ebus plugin which delivers date values in DD.MM.YYYY format. I didn't manage to configure the input control with date picker to be compatible with this format (it forces to use the standard format YYYY-MM-DD).

I agree that the standard is well chosen, but I would prefer to be able to use the input date-picker control with the ebus plugin states without converting the date format via a scripting solution.