Sequence Calendar and or Date choices

Hey guys,

I'm building out a year-long email sequence to send out to Saas product users. It would be very helpful for me to better manage and visualize the sequence if there were a calendar or at least date choices. 

AKA send out x email on x date VS wait x amount of days

Currently, I'm mapping it out on a printed calendar so I can visualize!

Cheers,