I wish there was a way (either through the admin tool or by working with an Omni consultant) to customize the calendar months / years to suit any situation.
For example, our business works in "marketing periods" instead of months. There are 13 marketing periods in a year, each containing 4 weeks (except every few years, the 13th period has 5 weeks from the carryover). Additionally, the fiscal weeks run from Thur - Wed. None of the custom calendar options suit the needs of my business.
Ideally, I'd like to say:
-The year starts on "mm/dd/yyyy"
-The fiscal week runs Thur - Wed
-Break down my calendar into 13 periods with 4 weeks each
-Every "x" years, the 13th period should contain an extra week