72 lines
1.9 KiB
TypeScript
72 lines
1.9 KiB
TypeScript
import type { VisibleDateRange } from '../types'
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export function parseCalendarDate(value: string | null | undefined): Date | null {
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if (!value) return null
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const parts = /^(\d{4})-(\d{2})-(\d{2})/.exec(value)
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if (!parts) return null
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const year = Number(parts[1])
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const month = Number(parts[2]) - 1
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const day = Number(parts[3])
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const date = new Date(year, month, day)
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return date.getFullYear() === year && date.getMonth() === month && date.getDate() === day
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? date
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: null
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}
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export function startOfLocalDay(date: Date): Date {
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const start = new Date(date)
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start.setHours(0, 0, 0, 0)
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return start
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}
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export function shiftLocalDays(date: Date, days: number): Date {
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const shifted = new Date(date)
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shifted.setDate(shifted.getDate() + days)
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return shifted
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}
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export function shiftLocalMonths(date: Date, months: number): Date {
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const shifted = new Date(date)
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const targetDay = shifted.getDate()
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shifted.setDate(1)
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shifted.setMonth(shifted.getMonth() + months)
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const lastDayOfTargetMonth = new Date(
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shifted.getFullYear(),
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shifted.getMonth() + 1,
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0,
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).getDate()
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shifted.setDate(Math.min(targetDay, lastDayOfTargetMonth))
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return shifted
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}
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export function daysVisibleRange(date: Date, days: number): VisibleDateRange {
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const start = startOfLocalDay(date)
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const end = shiftLocalDays(start, Math.max(1, days))
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return {
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startMs: start.getTime(),
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endMs: end.getTime(),
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}
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}
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export function monthGridVisibleRange(date: Date): VisibleDateRange {
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const firstDay = new Date(date.getFullYear(), date.getMonth(), 1)
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const gridStart = new Date(firstDay)
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gridStart.setDate(gridStart.getDate() - gridStart.getDay())
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const lastDay = new Date(date.getFullYear(), date.getMonth() + 1, 0)
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const weeks = Math.ceil((firstDay.getDay() + lastDay.getDate()) / 7)
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const gridEnd = shiftLocalDays(gridStart, weeks * 7)
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return {
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startMs: gridStart.getTime(),
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endMs: gridEnd.getTime(),
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}
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}
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