RFC 5545, "Internet Calendaring and Scheduling Core Object Specification (iCalendar)", September 2009

Note: This RFC has been updated by RFC 5546, RFC 6868, RFC 7529, RFC 7953, RFC 7986, RFC 9073, RFC 9074, RFC 9253

Errata ID: 3405
Status: Rejected
Type: Technical
Publication Format(s) : TEXT
Reported By: Peter Hermann
Date Reported: 2012-11-09
Rejected by: Barry Leiba
Date Rejected: 2012-11-09

Section 3.3.10. says:

       weekday     = "SU" / "MO" / "TU" / "WE" / "TH" / "FR" / "SA"
       ;Corresponding to SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY,
       ;FRIDAY, and SATURDAY days of the week.

It should say:

       weekday     = "MO" / "TU" / "WE" / "TH" / "FR" / "SA" / "SU"
       ;Corresponding to MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY,
       ;SATURDAY, and SUNDAY days of the week.

Notes:

It is worldwide accepted that a working business week begins with
a monday in all business related activities (stock exchange etc. etc).

See also:
package Ada.Calendar.Formatting is
-- Day of the week:
type Day_Name is (Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday);
--VERIFIER NOTES--
This isn't an error in the document. Regardless of your opinion of whether the week should begin on Sunday, Monday, or Thursday, ABNF does not create any particular ordering. Implementations are always free to order them as they please.

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