Sources for drama airdates?

 emeraldarrows:

Where do I find sources to for a drama's air dates that has finished airing in order to edit it so I can mark it as completed? There are many times that I know a drama has ended because I've watched the last episode, but without a true source my edits are always rejected. 

wikipedia usually has it (native language not english) otherwise i try to find the website of the channel that the drama is airing and hope that it's there,lastly i might go and check their instagram page in case a post they do says last ep airing today 20:00 for example and it was posted the day the show finished