🕐 Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and back. Supports seconds/ms, timezones, bulk conversion, and a live "Now" clock.
▸ Bulk Convert (one timestamp per line)
How to Use
1
Enter a timestamp or date
Type a Unix timestamp (seconds or milliseconds) in the first field, or pick a date/time. The tool auto-detects seconds vs milliseconds.
2
Select your timezone
Choose UTC, your browser's local timezone, or any named timezone from the dropdown. All output formats update instantly.
3
Copy any format
Click Copy next to any output row — Unix seconds, milliseconds, ISO 8601, localized date, or relative time.
Frequently Asked Questions
What is a Unix timestamp?
A Unix timestamp (also called epoch time) is the number of seconds that have elapsed since January 1, 1970 00:00:00 UTC. It is the universal standard for representing time in software systems because it has no timezone ambiguity and is easy to do arithmetic on.
What is the difference between seconds and milliseconds?
Standard Unix timestamps count seconds since epoch (10 digits for modern dates, e.g. 1714694400). JavaScript's Date.now() and many APIs return milliseconds (13 digits, e.g. 1714694400000). This tool auto-detects which you've entered based on the number of digits.
How do I convert a date to a Unix timestamp in JavaScript?
Use Math.floor(new Date("2024-05-01").getTime() / 1000) for seconds, or Date.now() / 1000 for the current time. The tool does this conversion instantly for any date you enter.
What is the Unix timestamp for the year 2038 problem?
The Year 2038 problem (Y2K38) affects 32-bit signed integers, which overflow at Unix timestamp 2147483647 (January 19, 2038, 03:14:07 UTC). Modern 64-bit systems are not affected — they can represent dates billions of years in the future.
Can I convert multiple timestamps at once?
Yes. Use the Bulk Convert section — enter one Unix timestamp per line and click Convert All to get all dates formatted at once.
完整指南：Unix时间戳转换器
什么是Unix时间戳？
Unix时间戳是自1970年1月1日00:00:00 UTC以来经过的秒数。是计算机系统中日期时间的通用标准：数据库、服务器日志、API都使用它。与时区无关，非常适合全球分布式系统。
如何使用
- 输入Unix时间戳转换为可读日期，或输入日期获取时间戳。
- 选择时区查看本地表示。
- 结果以多种格式显示（ISO 8601、本地、UTC）。
专业技巧
- JavaScript的
Date.now()返回毫秒级时间戳，比Unix秒级大1000倍。 - 在数据库中以时间戳存储日期，查询高效且时区处理简单。
- "2038年问题"影响32位整数时间戳——使用64位整数安全至292百万年后。