Convert timestamps to readable dates (auto-detects seconds/milliseconds), show results in multiple timezones, relative time, compare 10 major city time zones, and calculate date differences.
Current Time
Unix Seconds
1776910923
Unix Millis
1776910923387
ISO 8601
2026-04-23T02:22:03.387Z
Timestamp → Readable Date
Readable Date → Timestamp
❓ FAQ
What is a Unix timestamp? What's the difference between 10-digit and 13-digit?
A Unix timestamp counts the time elapsed since 1970-01-01 00:00:00 UTC. A 10-digit timestamp is second-precision (e.g. 1700000000); a 13-digit timestamp is millisecond-precision (e.g. 1700000000000). This tool auto-detects the length and converts correctly.
Why does the same timestamp show different times in different timezones?
A timestamp is absolute UTC time with no timezone info. Converting to a readable date requires a timezone. Beijing (UTC+8) is 8 hours ahead of UTC; New York (UTC-5) is 5 hours behind. The timestamp is identical — only the local representation differs.
What is ISO 8601 format?
ISO 8601 is the international standard for date-time representation, e.g. 2024-01-15T08:30:00.000Z. The T separates date and time; the trailing Z means UTC. It's the most common format in APIs, databases, and logs — JavaScript's new Date().toISOString() outputs this format.
What units does the date difference calculator support?
Days, weeks, approximate months (calculated at 30.44 days/month), and milliseconds. Note that months are approximate since month lengths vary. For exact month differences, use the day count as the authoritative value.