Posting Ads

Hi, I have some question on Posting Ads.

Note: In the system, i had set the advertisement is publish for 3 months.

If i had create a Ads on 1 March 2015 (Refer Item A at Attachment), then it should be expired or the listing will be taken down on 31 May 2015. Rite? Note: Item B and C is empty fields.

This is my question:-
1. If i set Item B (Start Publish Date) on 1 April 2015, But create Ads on 1 March 2015, then which date will be taken down? Note: Item C is empty fields.
2. If i set Item C (Ending Publish Date) on 31 December 2015, But the Ads creation date is the same on 1 March 2015, then is it the listing only will be taken down on 31 December 2015? (Note: i had try this, but in the front-end agent profile system is still showing expired on 31 March 2015. Then this expired date i should to ignore it? (Refer to sample attachment of the front-end image: expired posting.jpg)

Thanks

Jeffrey