Cant disable specific date

for days i can’t disable specific date: for example I want to disable the second of may 2022 – in the field page I type like the rule said on this form: 5-02-2022. But it doesnt work, i can still choose the second of may. in inspect mode of jscript it stands this code.

`var disableDates = ‘5-02-2022’;
disableDates = disableDates.split(“,”);
/* Sanitize the dates */
for (var i = 0; i < disableDates.length; i++) { disableDates[i] = disableDates[i].trim();
} ´

can u help me why?

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