Autopost a post buffer

Hello. I’m working on a plugin for wordpress similar in nature to compicpress. I, and several online friends, use wordpress to post regular updates to written stories (just like a webcomic). It works just fine, but it’s a pain to add stories into your buffer (having to manually set the date and time for it to publish in the future). I’d like to be able to have wordpress automatically post the episode for me, without me having to manually set the publish date each time.

For example:

I have two series: The Adventures of Jimmy , and Gwarsland (these do not exist, I promise :P). The Adventures of Jimmy updates every wednessdeay and Gwarsland updates every friday and saturday.

At 12:01AM Wednesday, I want it to post the next episode in The Adventures of Jummy. At 12:01AM on Friday, I want it to post the next episode in Gwarsland. At 12:01AM on Saturday, I want it to post the next episode in Gwarsland. (yes, again.

If anyone can help, this will be very helpful. Thanks for reading!