Date Calculator
在浏览器本地做日期加减或计算两日相差天数。免注册、不上传，适合排期与简单期限估算。
Interactive controls load with JavaScript. Processing stays in your browser.
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How to use
- 输入起始日期，选择「加/减天数」或「与另一日相差」。
- 天数可为负数表示往前推。
- 结果给出 ISO 日期与星期。
- 全部本地计算，不上传。
FAQ
Does Date Calculator upload my data?
No. Date Calculator runs locally in your browser and does not upload content to www.518882.com or third-party APIs.
Do I need an account?
No. Open and use — no signup, login, or paywall. Open Date Calculator and use it — no signup, login, or paywall.
How is this different from upload-based tools?
Tools run locally in your browser; content is not sent to our servers for processing — suited to private text and drafts.
Are there limits?
Limited by device memory and the browser; very large inputs may slow the page. There is no account quota.