Which week numbering system is used for happens date filters?

[arthur-st]

https://publish.obsidian.md/tasks/Queries/Filters#Happens

I'm setting up some filters on happens date that are specific to a week. The logic is clear, but I'm not confident whether I understand which week numbering system Tasks uses for internal representation - is it regular weeks or ISO weeks? If it's the former, can I customize/configure the plugin so that my filters can rely on ISO weeks specifically?

[claremacrae]

Hi I’m ok mobile with be try limited time….

The explanation is here - near the top of the page you linked to:
https://publish.obsidian.md/tasks/Queries/Filters#Relative+date+ranges

Best thing is to add an ‘explain’ line to your query and you will see what is happening.

[arthur-st]

I have tried explain, and it doesn't quite yield the answer to my question, e.g.:

Explanation of this Tasks code block query:

  filter by function task.done.moment?.isSame(moment("2024-04-01").subtract(1, 'weeks'), 'week') || task.cancelled.moment?.isSame(moment("2024-04-01").subtract(1, 'weeks'), 'week') || false

  group by status.type

  No sorting instructions supplied.

What I was unsure about is whether if isSame(x, 'week') operations happens in the coordinate system of ISO weeks or non-ISO weeks. Looking at the isSame reference now on Moment's API documentation, it looks like I can switch this to ISO weeks by using 'isoWeek' in place of 'week'.

[arthur-st]

Or, to be fully clear, I had a normal happens filter, and a functional done/cancelled filter, and I've updated them all to now use function syntax with isoWeek to use the week numbers that I want them to use.

[claremacrae]

I have tried explain, and it doesn't quite yield the answer to my question...

Here is how explain and happens work together:

```tasks
not done
happens this week
explain
```

Gives:

Explanation of this Tasks code block query:

  not done

  happens this week =>
    due, start or scheduled date is between:
      2024-04-01 (Monday 1st April 2024) and
      2024-04-07 (Sunday 7th April 2024) inclusive

What I was unsure about is whether if isSame(x, 'week') operations happens in the coordinate system of ISO weeks or non-ISO weeks.

Ah right, now that is a JavaScript/Moment question, not a Tasks question...

I'm glad you got it working anyway...

[arthur-st]

I see, I should've tried query explainer on the other filter block I had, which used native Tasks syntax - that would've explained which week system Tasks is resolving internally if taken for the first/last week of a year. Makes sense, thanks for following up on this.