Date Util

Date Util provides date formatting and parsing using date-fns internally. Formatting defaults come from AppConstants (SystemConfig.SYSTEM_DATE_FORMAT, SystemConfig.SYSTEM_DATE_TIME_FORMAT, and related values).

Use it when you need consistent app-wide date display (e.g. MM/dd/yyyy) or when converting form/API dates to or from ISO (YYYY-MM-DD).

Import

import {
	formatToAppDateTime,
	formatToAppDate,
	formatIsoToAppDate,
	formatOldDateToIsoString,
	formatOldDateToIsoDate,
	parseIsoDate,
	formatUnixTimeToOldDate,
	isAfter,
} from '@js-smart/react-kit';

Format to app display

formatToAppDate(new Date()); // e.g. "02/08/2026"
formatToAppDateTime(new Date()); // e.g. "02/08/2026, 10:30:00 AM"
formatToAppDate('2026-02-08'); // same, from ISO string
formatIsoToAppDate('2026-02-08'); // app date format from ISO date string

Format to ISO (YYYY-MM-DD)

formatOldDateToIsoString(new Date()); // e.g. "2026-02-08"
formatOldDateToIsoDate(new Date()); // same (alias)

Parse to Date

parseIsoDate('2026-02-08'); // Date at local midnight
parseIsoDate(null); // null
formatUnixTimeToOldDate(1707350400000); // Date from Unix timestamp

Comparison

isAfter(new Date('2026-02-09'), new Date('2026-02-08')); // true
isAfter(undefined, new Date()); // false

API Reference

Function	Description
formatToAppDateTime(date)	Format Date or ISO string to app date-time string (locale + time zone).
formatToAppDate(date)	Format Date or ISO string to app date string.
formatIsoToAppDate(date)	Format ISO date string to app date string.
formatOldDateToIsoString(date)	Format Date or string to ISO date string (YYYY-MM-DD). Accepts null.
formatOldDateToIsoDate(date)	Same as formatOldDateToIsoString.
parseIsoDate(date)	Parse ISO date string to Date at local midnight. Returns null for null/undefined/empty.
formatUnixTimeToOldDate(date)	Convert Unix timestamp (number or string) to Date. Returns undefined for invalid input.
isAfter(date1, date2)	Returns true if date1 is after date2; otherwise false. Handles Date or ISO strings.

All formatting functions return an empty string for null/undefined/empty input unless noted.