Google Calendar
Filing dates and payment dates on the calendar you already keep.
A tax deadline three weeks out is only useful if it is somewhere you will see it. Obligations and their lead times appear on your own calendar rather than on a page you have to remember to open.

How to connect it
Open Connections and pick Google Calendar
Sign in with your Google account.
Choose which calendar
A dedicated one keeps business dates out of your personal week.
What arrives, and when
Nothing from the calendar. Dates go out to it.
Twelve months
reaches back on the first import
On request
this one refreshes when you ask it to, not on a timer
What it looks like

Google Calendar in Connections
Questions people actually ask
Can it see my meetings?
It writes the dates it puts there. Reading your existing schedule is not part of it.