Function normalizeDateString

src/utils/dateUtils.ts:435–470

(dateString: string)

 * Normalize a date string to YYYY-MM-DD format for storage/comparison
 */
export function normalizeDateString(dateString: string): string {
	if (!dateString) {
		return dateString;
	}

	try {
		// For timezone-aware strings, extract just the date part directly
		if (
			dateString.includes("T") ||
			dateString.includes("Z") ||
			dateString.match(/[+-]\d{2}:\d{2}$/)
		) {
			// Extract date part before 'T' or timezone marker
			const datePart = dateString.split("T")[0];
			// Validate that it's a proper YYYY-MM-DD format
			if (/^\d{4}-\d{2}-\d{2}$/.test(datePart)) {
				return datePart;
			}
		}

		// For non-timezone strings, parse with UTC anchor for consistent storage
		const parsed = parseDateToUTC(dateString);
		if (isValid(parsed)) {
			return formatDateForStorage(parsed);
		}
		return dateString;
	} catch (error) {
		tasknotesLogger.error("Error normalizing date string:", {
			category: "validation",
			operation: "normalizing-date-string",
			details: { dateString },
			error: error,
		});
		return dateString; // Return original if parsing fails
	}
}

/**
 * Create a safe Date object for a specific year/month/day in local timezone