1. get the date stored in ultimaData.txt as the value for variable ultimaData 2. if no date is retrieved, make the value of ultimaData 30 days before today (DD/MM/AAAA) 3. fill the field named ctl00$ContentPlaceHolder1$txtSelDataInicio with the value of ultimaData 4. click the button ctl00$ContentPlaceHolder1$btnConsultar 5. erase the contents of ultimaData.txt, saving today's date in it (DD/MM/AAAA)

def getData():
  global driver
  global ultimaData
  
  ultimaData = open("ultimaData.txt", "r")
  ultimaData = ultimaData.read()
  
  if ultimaData == "":
    ultimaData = datetime.now() + timedelta(-30)
    ultimaData = ultimaData.strftime("%d/%m/%Y")
  
  driver.find_element_by_name("ctl00$ContentPlaceHolder1$txtSelDataInicio").send_keys(ultimaData)
  driver.find_element_by_name("ctl00$ContentPlaceHolder1$btnConsultar").click()
  
  ultimaData = datetime.now().strftime("%d/%m/%Y")
  
  ultimaData = open("ultimaData.txt", "w")
  ultimaData.write(ultimaData)
  ultimaData.close()