Time & security

Unix Timestamp Converter

Convert between Unix timestamps and dates with time zone support and batch conversion.

Runs locally in your browser

Current timestamp

Timestamp → date and time

Timestamp Unit Time zone

Date and time → timestamp

Date and time Time zone

Batch conversion

Unit Time zone

One timestamp per line. Spaces, commas and semicolons also work.

About timestamps

What a timestamp is

A Unix timestamp counts the seconds since 1970-01-01 00:00:00 UTC, ignoring leap seconds. It describes an absolute instant and has no time zone; a time zone is only needed to render it as a clock reading.

Seconds or milliseconds

Precision differs between stacks: Unix tools and most HTTP APIs use seconds, while Date.now() in JavaScript and currentTimeMillis() in Java use milliseconds. The 1000x gap shifts dates by decades, so confirm the unit first.

Get the current timestamp in each language

JavaScript

Math.floor(Date.now() / 1000)

TypeScript

Math.floor(new Date().getTime() / 1000)

Python

import time
int(time.time())

Java

Instant.now().getEpochSecond()

time.Now().Unix()

Rust

SystemTime::now()
  .duration_since(UNIX_EPOCH)?
  .as_secs()

PHP

time()

Ruby

Time.now.to_i

#include <time.h>
time_t now = time(NULL);

DateTimeOffset.UtcNow.ToUnixTimeSeconds()

Swift

Int(Date().timeIntervalSince1970)

Kotlin

System.currentTimeMillis() / 1000

Shell

date +%s

MySQL

SELECT UNIX_TIMESTAMP(NOW())

SQLite

SELECT strftime('%s', 'now')

Lua

os.time()

Daylight saving and time zone data

Time zone offsets change by legislation rather than staying fixed. China observed daylight saving from 1986 to 1991, so historical instants in Asia/Shanghai have a UTC+09:00 offset. Browsers and runtimes rely on their own time zone database (tzdata) to apply such rules, which is why the same timestamp can render differently across JDK versions or operating systems. This page uses the time zone database built into your browser.

How it works

Convert between Unix timestamps and dates both ways, with seconds/milliseconds, time zone selection, batch conversion and a live clock.

CodeTK does not upload, store, or analyze tool input. Any saved draft remains in this browser only.