How can I transform weekday number to the ISO-standard, where weeks start on a Monday?

I’m creating a task-management system where I want a new week to start each Monday. I’m using Isoweeknumber() to calculate the week number, but I need help figuring out how to determine the weekday. The formula weekday() marks Sunday as day 1 each week, but I want it to be 7.

I solved this by using a lookup on a support table with the weekday names and iso numbers. I’m still interested in learning if there is a way to manage without a helper table.

hi @Bjorn_Hansell ,
since the Coda standard is that Sunday is the first day of the week and not Monday, you might consider this kind of logic:

Switchif(
thisRow.DayNbr=1,"7",
thisRow.DayNbr=2,"1",
thisRow.DayNbr=3,"2",
thisRow.DayNbr=4,"3",
thisRow.DayNbr=5,"4",
thisRow.DayNbr=6,"5",
thisRow.DayNbr=7,"6",
""
)

cheers, Christiaan

2 Likes

Hi @Christiaan_Huizer , good point.

An even shorter way would be:
Remainder([DayNbr]-2, 7)+1

6 Likes

wonderful @Federico_Stefanato ,

i had to look into that formula to see the beauty :wink:

2 Likes