Hey folks, Here's a list of names to contact directly about this issue, since TP is apparently ignoring this thread. Use LinkedIn, or find their phone/email based off their names.

Dirk Friel, Founder
Timothy Cusick, President
Bernardo Fanti, VP Engineering
Todd Palmer, Chief Engineer
Gear Fisher, CEO
Bryce Walsh, VP of IT
Ben Pryhoda, Sr. Director of Product

Let's get this change DONE!!!

What will make this a MUST-ADD to the immediate roadmap (or sprint development), Training Peaks?

Help us help YOU to make this program more efficient!

Agree. Please it an option as in Outlook and similar software.

Yes, Please! make Sun-Sat an option on the calendar.

Agree. I prefer my week to start wit Sunday.

I'm working in the middle east and the week starts on Sunday. Just paid for premium subscription and now found out that i can't change the start of the week! it is rare these days to find a program that doesn't allow you to edit this. As per comments below there is a large user base that would really benefit from this.
Your initial response was in March 2015 -ie a long time ago. Please advise how you are getting on with adding this feature.

I agree, I (and others) do not work a traditional Monday through Friday week. Our long runs are not always on a weekend. This is especially true for nurses (me), physicians, physical therapist, law enforcement, fire fighters, emergency medical personnel, public safety, entertainment artists/personel/support, stay at home parents with children home from school on weekends.....ie, a LARGE segment of the population is not being served.

This would be super handy for those of us living in the Middle East areas. Our working week starts on Sunday with Friday/Saturday being the days off.

agree- can you make it an option to display the calendar with Sunday as the start day?

I agree that this should be selectable or at least the default should have been Sunday first since that is by far more common.

Show me another calendar where the first day of the week is Monday? Syncing with Google calendar results with every entry being off by 1 day.

I'm only a novice programmer, but would seem like something that would only take about an hour to put in and for something that is supposed to be The ELITE training software, not to be able to choose this seems absurd.

I would really like to see an option to make Monday the start of the week!

I will stick with Garmin Connect unless and until Training Peaks makes the change -- Runners World uses TP for VIP program. I will address my concerns with them as well.
TP keeps hounding me at every move to pay them money to use the RW VIP calendar that is supposed to be free -- if they allowed flexibility, I might even consider it.

Please make Sunday the first day of the week! Or, at least make it an option. Thx!

Yup. Surely a high percentage of people have different start days to the normal 9 - 5 Mon - Fri middle man (woman). My schedule is Wed / Wed due to work commitments, makes it almost useless having the ATP function for me, something I like to use !! Surely its not a difficult change

yes, please add this feature, It is really annoying not to be able to change the first day of the week to line up with my work cycle here in the ME

I've just become a premium user and find it bizarre that I can't change the first day of the week to Sunday. How hard can it be?

I've been a Premium user for several years and would like to be able to change the first day of the week ever since first joining. Hoping it will become a user-editable option in the near future. As many others here have noted: nearly all other calendars allow this feature...

Same, I have an odd work work and would like that option.