Tested on the web-version and the latest desktop version. In the en-US locale all works fine. Below is example of a Date input.
{
"type": "Column",
"width": "stretch",
"items": [
{
"type": "Input.Date",
"id": "StartDate",
"min": "29.10.19"
}
]
},
{
"type": "Input.Text",
"id": "Text"
},
Result: after the user has sent the card, bot framework receives a json with the all input values except the date / time inputs:
{
"Text":"111",
// no field with "StartDate" name
}