免费 · 安全与隐私
TLS 证书有效期计算器.
按新的 200 天、100 天和 47 天上限，查看公共 TLS/SSL 证书在签发日的最长有效期、到期日和续期时间。
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使用方法: TLS 证书有效期计算器
输入数据或选择文件，调整设置并生成结果。复制或下载之前，请检查结果。
限制与支持格式
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英语技术说明
Rules for publicly trusted certificates only; private CAs set their own. Everything is calculated in your browser; nothing you type is uploaded.
CA/Browser Forum ballot SC-081: 398 days before 15 March 2026, then 200 days, 100 days from 15 March 2027 and 47 days from 15 March 2029, with domain-validation reuse falling to 10 days.
A certificate issued on 11 October 2026 can be valid for at most 200 days, so it expires on 29 April 2027; renewing with a third left means around 22 February 2027.