Canon calendar system

[Gamer_KM 90]

What do you think the canon for calendar system, I mean we have seen 4 day weeks, and stuff.

 

How do you think ponies keep track of important dates?

 

My head canon is: There calendar system is close to ours save for shorter weeks. and broke down into eras. the Era of DISCORD, first and self explanatory. Next is era of Harmony, the next part where Luna and Celestia rule. last is solar rule starting from when Celestia banished Luna going to today.

[Socrates 43]

I'm not sure what to think. Where have we seen 4 day weeks? If there was a canon way I'm sure you would not have been asking this question to begin with c:

[Gamer_KM 90]

In "lesson zero" Twilight's planner has only  4 days.