35 lines
1.1 KiB
TypeScript
35 lines
1.1 KiB
TypeScript
/**
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* 从中国大陆 18 位身份证号解析出生日期并计算周岁年龄。
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* 号码不足 18 位或出生日期无效时返回 null（不强制校验码，便于输入过程中回填）。
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*/
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export function calcAgeFromChineseIdCard(idCard: string | null | undefined): number | null {
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if (!idCard || typeof idCard !== 'string') return null
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const s = idCard.trim().toUpperCase()
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if (!/^\d{17}[\dX]$/.test(s)) return null
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const year = Number(s.slice(6, 10))
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const month = Number(s.slice(10, 12))
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const day = Number(s.slice(12, 14))
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if (!Number.isFinite(year) || !Number.isFinite(month) || !Number.isFinite(day)) return null
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if (month < 1 || month > 12 || day < 1 || day > 31) return null
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const birth = new Date(year, month - 1, day)
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if (
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birth.getFullYear() !== year ||
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birth.getMonth() !== month - 1 ||
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birth.getDate() !== day
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) {
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return null
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}
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const today = new Date()
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let age = today.getFullYear() - year
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const beforeBirthday =
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today.getMonth() < month - 1 ||
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(today.getMonth() === month - 1 && today.getDate() < day)
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if (beforeBirthday) age -= 1
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if (age < 0 || age > 120) return null
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return age
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}
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