Function validateDateTimeInput

src/utils/dateUtils.ts:1249–1276

(dateValue: string, timeValue?: string)

 * Validate datetime input (supports both date-only and date+time)
 */
export function validateDateTimeInput(dateValue: string, timeValue?: string): boolean {
	if (!dateValue || dateValue.trim() === "") {
		return true; // Empty is valid (optional field)
	}

	try {
		// Validate date part
		if (!validateDateInput(dateValue)) {
			return false;
		}

		// If time is provided, validate it
		if (timeValue && timeValue.trim() !== "") {
			// Check for HH:mm format
			if (!/^\d{2}:\d{2}$/.test(timeValue)) {
				return false;
			}

			// Validate the combined datetime
			const combined = combineDateAndTime(dateValue, timeValue);
			return validateDateInput(combined);
		}

		return true;
	} catch {
		return false;
	}
}

/**
 * Validates and filters a complete_instances array to contain only valid YYYY-MM-DD dates