Not able to configure User Filters in Record

I have to create a user filter

Filter on the basis of month selected. I have data, but that coming in DateTime format. I tried converting it to simple Month name, but unable to do that using tools provided in User Filters Expression editor. Below is my code.

a!localVariables(
  local!month: text(
    "RequestedDate",  /*DATA COMING IN DATETIME FORMAT, TRYING TO CHANGE HERE IN MONTH NAME*/
    "MMMM"
  ),
  a!recordFilterList(
    name: "Month",
    options: a!forEach(
      items: cons!OSR_TEXT_ARRAY_MONTHS, /*ARRAY OF MONTH NAMES eg. January, etc.*/
      expression: a!recordFilterListOption(
        id: fv!index,
        name: fv!item,
        filter: a!queryFilter(
          field: local!month,
          operator: "=",
          value: fv!item
        )
      )
    )
  )
)

Thanks

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