Calendar field editable for the user

this is not possible, if you want the field to be editable then you may use a text field with the "input mask" and set the mask to be of the date format you need

Remove the mask options and set a mask variable = dateoptions

Then in a Javascript view you need to define that variable:

document.addEventListener("DOMContentLoaded", function(event) {
dateoptions = {
    mask: Date,
    lazy: false,
    autofix: true,
    blocks: {
      d: {mask: IMask.MaskedRange, placeholderChar: 'd', from: 1, to: 31, maxLength: 2},
      m: {mask: IMask.MaskedRange, placeholderChar: 'm', from: 1, to: 12, maxLength: 2},
      Y: {mask: IMask.MaskedRange, placeholderChar: 'y', from: 1900, to: 2999, maxLength: 4}
    }
  }
})