简体中文

Developer tools

转换日期格式、Unix时间戳和时区

在浏览器中转换日期格式、Unix时间戳（epoch）、含夏令时的时区，并计算两个日期的差。不上传。

更改日期格式，在Unix时间戳与日期之间转换，切换世界时区，或计算两个日期相差几天——全部在本地完成。

  • 本地运行
  • 不上传
  • 即时
  • 免费
Mode

All conversions run in your browser with native date APIs. Your inputs are not sent to a server.

Values like 01/02/2026 are ambiguous (Jan 2 vs Feb 1). Use the date picker or an ISO-style value such as 2026-02-01.

使用方法

  1. 粘贴数据
  2. 运行操作
  3. 复制结果

为何选择 NEXNARA

  • 私密

    数据只留在浏览器中。

  • 即时

    结果立即显示。

  • 无需上传

    不会向 NEXNARA 服务器发送任何内容。

  • 随处可用

    无需安装。

Convert date formats

Turn a clear date or date-time into common formats such as YYYY-MM-DD, MM/DD/YYYY, DD/MM/YYYY, ISO 8601, or a readable locale string—without uploading anything.

Convert Unix timestamps

Convert epoch seconds or milliseconds to UTC and local times, or turn a date into Unix timestamps. Auto-detect usually treats 10-digit values as seconds and 13-digit values as milliseconds.

Seconds vs milliseconds

Unix seconds count whole seconds since 1970-01-01 UTC. Milliseconds include three extra digits. When auto-detect is unsure, choose the unit explicitly.

Convert time zones

Pick a source IANA time zone, a target zone, and a wall-clock date/time. Results use real zone rules for that date—not a fixed offset.

UTC and local time

UTC is the reference clock. Your browser time zone is detected with Intl and can be applied with Use my zone.

Daylight saving time

Offsets change with daylight saving. For example, America/New_York is not always UTC−5. This tool applies the IANA rules for the date you enter.

Calculate the difference between dates

Compare two dates (with or without time) to see total days, hours, minutes, and seconds, plus a calendar breakdown of years, months, and days.

Privacy

NEXNARA does not send your dates or timestamps to a server for this tool. Conversion happens in your browser.

What is a Unix timestamp?

A Unix timestamp counts seconds (or milliseconds) since 1970-01-01 00:00:00 UTC. It is a compact way to store an exact instant.

What is the difference between seconds and milliseconds?

Seconds are typically 10 digits around the present day. Milliseconds are usually 13 digits. The same instant is milliseconds = seconds × 1000.

How do I convert a timestamp to a date?

Open Unix Timestamp mode, paste the number, choose Auto-detect or the correct unit, then tap Timestamp → Date.

Can I convert UTC to local time?

Yes. In Time Zone mode set the source to UTC and the target to your zone, or use Unix mode which shows both UTC and local results.

Does the time zone converter handle daylight saving time?

Yes. It uses IANA time zone data via the browser, so DST rules for that date are applied instead of a hard-coded offset.

How do I find my local time zone?

Your browser zone is shown near the Time Zone controls. Use Use my zone to fill source or target.

Can I calculate days between two dates?

Yes. Date Difference mode reports total days and a calendar difference. Enable Compare dates only when times should be ignored.

Why can date formats like 01/02/2026 be ambiguous?

Some regions write month/day/year and others day/month/year. This tool does not guess—use the date picker or YYYY-MM-DD / ISO 8601.

Does NEXNARA send my date data to a server?

No. Date & Time Converter runs entirely in your browser for these conversions.