Function UpdateInitialDate

UpdateInitialDate(datePickerId: string, date1: string, date2?: string): string
Function that will update the InitialDate for a given DatepickerId When: SingleDate => Date1 = InitialDate => Date2 = Ignored!
```
	RangeDate
		=> Date1 = InitialStartDate
		=> Date2 = InitialEndDate
```
Parameters
- datePickerId: string
- date1: string
  The value for the date1
- Optionaldate2: string
  The value for the date2
Returns string
Response Object as a JSON String
- Defined in OutSystems/OSUI/Patterns/DatePickerAPI.ts:298