[Expression Editor: Last day of last month]

This works for finding last day of last month and is super simple:

Today(0 - DayNumber(Today()))

[Creating a folder using the REST service.]

For anyone still trying to do this, here is an example that worked for me. Creating the folder "Reports" under myorg locally.

Using PUT

url = 'http://localhost:8080/jasperserver-pro/rest_v2/resources/organizations/myorg/Reports'

headers = {'Content-Type': 'application/repository.folder+json'}

content = {"uri" :"/organizations/myorg/Reports", "label":"Reports", "description":"Create and save your own reports here.", "permissionMask":"0", "creationDate": "2013-07-04T12:18:47", "updateDate": "2013-07-04T12:18:47", "version":"0"}