Hi,
For your 1st Query you can use NUM=F (check in the tcode PE04) operation in your PCR to call the date type (use this PCR after DATES function in the schema, you will add DATES function in the schema and then in the next line use your custom PCR).
For your 2nd Query use the operation CMPER(Check in Tcode PE04) in your custom pcr to check the Jan 2016 and pass the amount to respective wage type.
Regards,
Sankarsan