Programming tutorials for people who want code that actually runs, not code that only looks right. Pick a language, start at the beginning, and don't skip the basics. They are where most problems come from.
Your date moves a day because one part of the code uses UTC and another uses local time. Find which step does it, keep calendar days as YYYY-MM-DD strings, and name the time zone when you format.
Replace long lists of positional arguments with one options object, destructured in the parameter list with defaults. Add = {} so a call with no argument doesn't crash, and know that defaults only replace undefined.
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