Support on JMWE function to checks 3 custom field values and a date value provided & auto transition

[JiraHelpDesk@fs.co.in]

I want to auto transition an issue based on 4 conditions, example script provided below. 

With the first 3 conditions my script is working but i also want to provide custom date value manually (not referring any field)and it should validate the date to check if it is within the end of month criteria along with the other 3 validations.

Help required to write the underlined line of query.

Sample Query below: 

issue.fields.customfield_12304.value == "Product X"

and

issue.fields.customfield_12303.value == "Customer X"

and issue.fields.customfield_12468.value == "Type X"

and 

"DD-MM-YYYY" <=today or "DD-MM-YYYY" <=endofthemonth