wordpress - Create a multilingual calendar in php - 'translating' with setlocale

I am creating an hourly calendar (a booking form), and I have my calendar created

    {-code-1}
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I have an array of booked dates in my{-code-2} variable.

Now since the site I'm working on is build on wordpress and translated with WPML, I can check the language of the site like:

{-code-3}
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So for instance for Swedish this will be{-code-4}, for Germande etc.

So I googled a bit, and what I found is that I can change the format of my time and dates by usingsetlocale(). So I tried:

if ($current_lang == '{-code-4}') {
    setlocale(LC_ALL, '{-code-4}-SE');
} elseif($current_lang == 'de') {
    setlocale(LC_ALL, 'de-DE');
} else{
    setlocale(LC_ALL, 'en-US');
}
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I also tried with just:

setlocale(LC_TIME, '{-code-4}-SE');
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But nothing changed on my frontend.

I tried putting myif-else loop with$timestamp inside (and even changed the name to match the translation), I put thefor loop in, but nothing changed.

How do I handle the translation when building calendar with php?