30 lines
922 B
TypeScript
30 lines
922 B
TypeScript
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export function parseISODate(value: string): Date | undefined {
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if (!isISODate(value)) return undefined
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const [year, month, day] = value.split("-").map(Number)
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return new Date(year!, month! - 1, day)
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}
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export function toISODate(date: Date): string {
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const year = date.getFullYear()
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const month = String(date.getMonth() + 1).padStart(2, "0")
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const day = String(date.getDate()).padStart(2, "0")
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return `${year}-${month}-${day}`
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}
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export function formatDate(date: Date, locale?: string): string {
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return new Intl.DateTimeFormat(locale, { dateStyle: "long" }).format(date)
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}
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export function isISODate(value: string): boolean {
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if (!/^\d{4}-\d{2}-\d{2}$/.test(value)) return false
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const [year, month, day] = value.split("-").map(Number)
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const date = new Date(year!, month! - 1, day)
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return (
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date.getFullYear() === year &&
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date.getMonth() === month! - 1 &&
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date.getDate() === day
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)
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}
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