Epoch Converter

Convert between Unix timestamps and human-readable dates. Auto-detects seconds vs milliseconds. Everything runs in your browser.

Current Unix Time

Seconds:

Milliseconds:

Epoch → Human Date

Timezone

Human Date → Epoch

Batch Convert

Paste multiple timestamps (one per line). Auto-detects seconds vs milliseconds.

Reference Timestamps

Name	Epoch (seconds)	Date (UTC)
Unix Epoch		January 1, 1970 00:00:00 UTC
Y2K		January 1, 2000 00:00:00 UTC
32-bit Overflow (Y2K38)		January 19, 2038 03:14:07 UTC
GPS Epoch		January 6, 1980 00:00:00 UTC
Max 32-bit unsigned		February 7, 2106 06:28:15 UTC

What is Unix Epoch Time?

Unix epoch time (also called Unix time, POSIX time, or Unix timestamp) is a system for tracking time as a running count of seconds since the Unix Epoch — January 1, 1970, 00:00:00 UTC. It's the most widely used time representation in computing.

For example, the timestamp 1700000000 represents November 14, 2023 22:13:20 UTC. Timestamps before the epoch are negative numbers.

Seconds vs Milliseconds

Some systems use seconds (10 digits, e.g. 1700000000) while others use milliseconds (13 digits, e.g. 1700000000000). This tool auto-detects which format you're using.

Seconds: Unix/Linux, Python time.time(), MySQL UNIX_TIMESTAMP(), PHP time()
Milliseconds: JavaScript Date.now(), Java System.currentTimeMillis(), Elasticsearch

The Year 2038 Problem (Y2K38)

Systems storing Unix time as a signed 32-bit integer will overflow on January 19, 2038 at 03:14:07 UTC (timestamp 2,147,483,647). After this point, the time wraps to a negative number, interpreted as December 13, 1901. Most modern systems use 64-bit integers, which won't overflow for ~292 billion years.

Common Commands

# Current epoch (seconds)
date +%s

# Convert epoch to date
date -d @1700000000           # Linux
date -r 1700000000            # macOS

# Convert date to epoch
date -d "2023-11-14 22:13:20 UTC" +%s   # Linux

# Python
python3 -c "import time; print(int(time.time()))"

# JavaScript
console.log(Math.floor(Date.now() / 1000))

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