@pro-fa/expreszo-datetime

Optional Luxon-backed date/time functions for @pro-fa/expreszo.

The core @pro-fa/expreszo package never depends on Luxon. Install this companion only when your expressions need date math.

Install

npm install @pro-fa/expreszo @pro-fa/expreszo-datetime

Usage

import { defineParser, fullParser } from '@pro-fa/expreszo';
import { dateTimePlugin }            from '@pro-fa/expreszo-datetime';

const parser = defineParser({ ...fullParser })
  .use(dateTimePlugin);

parser.parse("format(addDuration(now(), 7, 'days'), 'yyyy-MM-dd')").evaluate();

Polymorphic inputs

Every datetime function accepts any of these shapes for date arguments and normalises internally:

• A Luxon DateTime
• A JavaScript Date
• An ISO 8601 string ('2026-01-01T00:00:00Z')
• A millisecond Unix timestamp

Functions that produce a date return a Luxon DateTime — chain freely:

parser.parse("format(addDuration('2026-01-01', 7, 'days'), 'yyyy-MM-dd')").evaluate();
// => '2026-01-08'

Function reference

~70 functions across the categories below. Full reference with examples in the Date / Time docs page.

• Construction: now, today, yesterday, tomorrow, parseISO, parseDate, fromMillis, fromUnix, dateTime, date, time
• Inspection — calendar parts: year, month, day, hour, minute, second, millisecond, quarter, dayOfWeek, dayOfYear, weekOfYear, isoWeekYear, daysInMonth, daysInYear, weeksInYear, offsetMinutes, offsetHours, zoneName, isLeapYear, isDST, isWeekend, isWeekday, isValid
• Inspection — relative-to-now: isToday, isYesterday, isTomorrow, isThisWeek, isThisMonth, isThisYear, isInPast, isInFuture, age
• Arithmetic: addDuration, subtractDuration, startOf, endOf, diff, clampDate, minDate, maxDate
• Comparison: isBefore, isAfter, isSame, isBetween, compareDates, overlapsRange, containsDate
• Range / sequence: dateRange, businessDaysBetween, weekdaysBetween
• Distance from now: daysUntil, daysSince, hoursUntil, hoursSince, minutesUntil, minutesSince
• Format / zone: format, toISO, toMillis, toUnix, toRelative, toRelativeCalendar, setZone, toUTC, toLocal

unit arguments accept 'year'(s), 'quarter'(s), 'month'(s), 'week'(s), 'day'(s), 'hour'(s), 'minute'(s), 'second'(s), 'millisecond'(s) — same vocabulary Luxon uses.

Spread-into-defineParser form

If you prefer the legacy preset composition:

import { defineParser, fullParser } from '@pro-fa/expreszo';
import { withDateTime }              from '@pro-fa/expreszo-datetime';

const parser = defineParser({
  operators: [...fullParser.operators],
  functions: [...fullParser.functions, ...withDateTime.functions]
});