<ul><li>When dealing with dates and times in applications, handling different time zones can lead to unexpected challenges.</li><li>JavaScript's parsing of ISO date strings can behave unexpectedly, causing inconsistencies when using new Date(str) and parseISO(str) functions.</li><li>Full ISO datetime strings with a 'Z' at the end are parsed as UTC and converted to local time, while datetime strings without 'Z' are interpreted as local time by both functions.</li><li>Date-only strings without a time component can lead to different results where parseISO(str) treats them as local time, while new Date(str) interprets them as midnight UTC, potentially causing discrepancies.</li></ul>

The Subtle Trap of ISO Date Strings in JavaScript

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