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// Store/send as ISO string (UTC) const stored = new Date().toISOString(); // "2024-06-15T10:30:00.000Z" // Display in user locale const display = new Intl.DateTimeFormat(navigator.language, { dateStyle: "medium", timeStyle: "short", }).format(new Date(stored)); // Validate date input function isValidDate(str) { const d = new Date(str); return !isNaN(d.getTime()); } // Use a library for complex operations (date-fns, Luxon) import { addBusinessDays, formatDistanceToNow } from "date-fns";
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