An SAP Consultant

REPORT ZTEST_NOTEPAD.
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*Declaration
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data:
      first_day LIKE  VTBBEWE-DVALUT,
      last_day  type datum,
      days(2)   TYPE c.
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*selection screen
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PARAMETERS:
          p_month(2) type n,
          p_year(4)  type n.
*&----------------------------------------------------------------------------------*
*Start-of-selection
*&----------------------------------------------------------------------------------*
START-OF-SELECTION.
"First date of the month
CONCATENATE p_year p_month '01' INTO first_day.
CALL FUNCTION 'END_OF_MONTH_DETERMINE_2'
  EXPORTING
    i_datum = first_day
  IMPORTING
    E_TT    = days.
"Last date of the month
CONCATENATE p_year p_month days INTO last_day.

WRITE:/ first_day,
/ last_day.