Date (helping-js/core/date)

Clone, add intervals, month bounds, a simple month grid, and ISO-ish parsing.

Imports

import {
  cloneDate,
  addDate,
  getMonthStart,
  getMonthEnd,
  getCalendar,
  parseISO,
  isIsoFormat,
} from 'helping-js/core/date'

API

Function	Role
cloneDate(date)	New Date with same time
addDate(date, { years, months, days, hours, minutes, seconds })	Mutable-style copy; returns new date
getMonthStart / getMonthEnd	Start/end of month
getCalendar(year, month)	Weeks of `{ date, label }
parseISO(str)	new Date(str) or null if invalid
isIsoFormat(str)	Loose YYYY-MM-DD prefix check

Samples

Shift a deadline

const end = addDate(new Date(), { days: 7 })

Calendar UI month

const weeks = getCalendar(2026, 3) // March 2026
// weeks[0] is first row (7 cells); cells are null or { date, label }

Express: parse date query

import { parseISO, isIsoFormat } from 'helping-js/core/date'

const since = req.query.since
const d = since && isIsoFormat(since) ? parseISO(since) : null

Vue: month range

import { getMonthStart, getMonthEnd } from 'helping-js/core/date'

const start = getMonthStart(selectedDate)
const end = getMonthEnd(selectedDate)

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