Extract Day Of Week

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I need a calculation that I can use within a set field script step that will look at the current date and from that determine what the date on the Monday of that week is/was.

Similarly I'll need calcs for each or the remaining four business days, but I'm assuming if someone can point me in the right direction for the Monday calculation, I can alter it to get the calcs for the rest of business week.

I'm pretty sure that I've seen this calc before but I can't seem to locate it anywhere. Any help would be much appreciated.

Thanks

[comment]

This week's Sunday:

dateX - DayofWeek(dateX) + 1

This week's Monday:

dateX - DayofWeek(dateX) + 2

and so on..

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That's great. Works perfectly. Thanks.