SAP Analytics Cloud reports unable to get current date and difference between two dates?

Hi

In SAP Analytics cloud, I would like to get current date in my reports. anyone can help me on this. My source system is Successfactors employee central.

Second thing, I would like to compare 2 date fields in my reports for how long a employee worked in organization. Example - Employee hire(01.01.2016)- Termination date (01.01.2017) Any help will be much appreciated in my both queries.