1) What will be the last date of filing in proper court?
It will be 21/12/2014
2) is the date of 21/11 excluded?
Since 21/12/2014being a Sunday, it can be filed immediately on the following working day.
3) Should I have filed the case on 20/12 which is Sat or it can be filed on Mon 22/12 next working day?
Yes it can be fled on Monday, the 22.12.2014.
4) Is delay condoned in transfer cases of 138 after 30 days?
No. The delay in such cases is not condoned.