The date format in Anaplan is presented based on user browser settings, which would either be represented as DD/MM/YYYY or MM/DD/YYYY.
However, to represent the date in any other format apart from the above such as DD MMM YYYY, a separate line item formatted as text can be created with custom formula referencing date line item to achieve the same.
Yes, i have created a separator to identify the Day, Month and Year as per image below. However, i'm not sure how to change the numeric month 4, to April and I'm not sure how to combine the day month and year together in a line item, so that it read 1 April 2020.
To create the name of the month you need create a new list for the months of the year. Use the month number as the code and map your month number in you module to the code in the new list using FINDITEM.
To combine them into a single line item convert you items into TEXT format and concatenate them using "&" to separate each source line item.