how can i select 5 dates in one calender view

No. You will need to have 5 fields. If the user should pick one date after the other, you could do that in a wizard style dynamic interface.

a!localVariables(
  local!date,
  local!dates,
  if(
    a!isNullOrEmpty(local!dates),
    a!dateField(
      label: "Date",
      labelPosition: "ABOVE",
      value: local!date,
      saveInto: {
        local!date,
        a!save(
          local!dates,
          a!forEach(enumerate(5) + 1, local!date + fv!item)
        )
      },
      validations: {}
    ),
    a!forEach(
      items: local!dates,
      expression: a!dateField(
        label: "Date",
        labelPosition: "ABOVE",
        value: fv!item,
        saveInto: fv!item,
        validations: {}
      )
    )
  )
)

Appian does not support multiple date selection in a single Date Calendar Component.

Thanks for the code but i want to add 5 dates in one date field .

If you have a specific date range, you could use a drop down list.

a!localVariables(
  local!dates: a!forEach(
    items: enumerate(60) - 30,
    expression: today() + fv!item
  ),
  local!selection: {},
  local!count: length(local!selection),
  a!multipleDropdownField(
    label: "Dates (" & local!count & ")",
    instructions: "Select 5 dates",
    choiceLabels: a!forEach(
      items: local!dates,
      expression: text(fv!item, "dd mmm yyyy")
    ),
    choiceValues: local!dates,
    value: local!selection,
    saveInto: local!selection,
    validations: {
      if(local!count = 5, null, "Select 5 dates")
    }
  )
)