Hi,
The datetext function returns incorrect date with different locale settings. Please refer below:
datetext(ri!dateInput, "dd MMM YYY")
Input Date: 12/29/2021 - English/United states as locale -> 29 Dec 2022
Input Date: 29/12/2021 - English/United Kingdom as locale -> 29 Dec 2021 - this is correct.
The dateInput is sent as a rule input of type 'Date' to the expression rule.
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I did see the same thing happening. Switched local couple of times, used date selector, userdatevalue() and date() functions as input. After that issue didn't occur anymore. Strange