[cj]

A quick Google shows 65% of public companies use calendar year as their FY.

At our startup, it's even more complicated :) we use calendar year for official financial / business metrics, while our planning quarter is offset by 1 month (Q1 = Feb/Mar/Apr).

[Raed667]

Same.. This is my personal hell

[lmkg]

At least you're using the actual months. I've recently had to deal with 4-5-4 Retail Calendars. Explaining to my coworkers why the data for September includes dates from both August and October, and that's Working As Intended.