How to Generate the Number of the Calendar Week?

I want to put a week number at the start of bits of text I create. Is it as simple %numberdate% / 7?

The simple answer is %ICUDateTime%w%.

The complicated answer is that there are several ways to define the week of the year, so there could be some confusion if you're trying to communicate with someone else.

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Footnote:

ISO 8601 offers a formalisation of one approach, but it takes the view that weeks start on Monday – an assumption that doesn't work everywhere.

I never did say thanks. For my purposes this is perfect. I just needed the week number at the front of my weekly review notes so that they sort correctly inside TheBrain.

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See this topic for a deeper discussion Week Number One Ahead of Actual Week - #14 by tjluoma