This is one of those cool websites that when I open for the first time I usually say : "Oh that's awesome, I should bookmark it and use more often" and then after 1 hour It's totally forgotten until the next time I clean my bookmarks.
Anyway TV Shows episode calendar is really useful and I think it's a nice idea to have this information arranged in this way.
maybe check out https://trakt.tv/, I have been using it for more than 3 years and it's absolutely amazing. It even has multiple mobile apps, I personally use SeriesGuide on my android phone.
I had the same use case as you, so I built a similar app except instead of a GUI, it sends me a text message. Right now I have it fire when a new episode of Silicon Valley is posted.
I really should polish it up and release it. This is the second or third thread where other people have mentioned a similar need.
Several other people have commented on their solutions, but my favorite solution is tvmaze.com/calendar
It's easy to create an account and mark your favorite shows so you get a custom calendar, or you can view a calendar with the overall most popular shows.
Anyway TV Shows episode calendar is really useful and I think it's a nice idea to have this information arranged in this way.