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export const isYmd = (s: string) => /^\d{4}-\d{2}-\d{2}$/.test(s)
// YYYY-MM-DDを文字列比較で前後判定（形式が正しい前提）
export const isBeforeYmd = (a: string, b: string) => a < b
const toLocalYmd = (date: Date): string => {
const year = date.getFullYear()
const month = String(date.getMonth() + 1).padStart(2, '0')
const day = String(date.getDate()).padStart(2, '0')
return `${year}-${month}-${day}`
}
export const parsePickerDate = (
value: string | Date | null
): Date | undefined => {
if (!value) return undefined
if (value instanceof Date) return Number.isNaN(value.getTime()) ? undefined : value
const ymdMatch = /^(\d{4})-(\d{2})-(\d{2})$/.exec(value)
if (ymdMatch) {
const year = Number(ymdMatch[1])
const month = Number(ymdMatch[2]) - 1
const day = Number(ymdMatch[3])
const date = new Date(year, month, day)
return Number.isNaN(date.getTime()) ? undefined : date
}
const date = new Date(value)
return Number.isNaN(date.getTime()) ? undefined : date
}
/**
* Date, string, null を受け取って 'YYYY-MM-DD' に正規化
*/
export const normalizeToDateString = (v: unknown): string | null => {
if (!v) return null
if (typeof v === 'string') {
if (/^\d{4}-\d{2}-\d{2}$/.test(v)) return v
const d = new Date(v)
if (Number.isNaN(d.getTime())) return null
return toLocalYmd(d)
}
if (v instanceof Date) {
if (Number.isNaN(v.getTime())) return null
return toLocalYmd(v)
}
return null
}
/**
* Date, string, null を受け取って 'HH:mm' に正規化
*/
export const normalizeToTimeString = (v: unknown): string | null => {
if (!v) return null
if (typeof v === 'string') {
if (/^\d{2}:\d{2}$/.test(v)) return v
const d = new Date(v)
if (Number.isNaN(d.getTime())) return null
return d.toISOString().slice(11, 16)
}
if (v instanceof Date) {
if (Number.isNaN(v.getTime())) return null
return v.toISOString().slice(11, 16)
}
return null
}
/**
* Date, string, null を受け取って 'YYYY-MM-DDTHH:mm' に正規化
*/
export const normalizeToDateTimeString = (v: unknown): string | null => {
if (!v) return null
if (typeof v === 'string') {
if (/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}$/.test(v)) return v
const d = new Date(v)
if (Number.isNaN(d.getTime())) return null
return d.toISOString().slice(0, 16)
}
if (v instanceof Date) {
if (Number.isNaN(v.getTime())) return null
return v.toISOString().slice(0, 16)
}
return null
}
/**
* 日付文字列を指定されたフォーマットで整形する
* @param dateStr 日付文字列
* @param format 出力フォーマット (デフォルト: yyyy-mm)
*/
export const formatDate = (
dateStr: string | undefined,
format: 'yyyy-mm' | 'mm-dd' | 'yyyy-mm-dd' = 'yyyy-mm',
) => {
if (!dateStr) return ''
const date = new Date(dateStr)
// 無効な日付の場合は空文字を返す
if (isNaN(date.getTime())) return ''
const year = date.getFullYear()
const month = String(date.getMonth() + 1).padStart(2, '0')
const day = String(date.getDate()).padStart(2, '0')
switch (format) {
case 'yyyy-mm':
return `${year}-${month}`
case 'mm-dd':
return `${month}-${day}`
case 'yyyy-mm-dd':
return `${year}-${month}-${day}`
default:
return `${year}-${month}`
}
}
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