What is a Unix Timestamp (Epoch Time)?

A Unix timestamp is the number of seconds that have elapsed since January 1, 1970, 00:00:00 UTC (the Unix Epoch), excluding leap seconds.

How to tell if a timestamp is in seconds or milliseconds?

Timestamps in seconds currently have 10 digits (e.g., 1700000000), while timestamps in milliseconds have 13 digits (e.g., 1700000000000). This converter automatically detects seconds vs. milliseconds.

What is the Year 2038 Problem (Y2K38)?

Systems that store Epoch time as a signed 32-bit integer will overflow on January 19, 2038 at 03:14:07 UTC. Modern 64-bit systems resolve this limitation.

How do timezones affect Epoch timestamps?

Epoch timestamps are independent of timezones because they represent a specific absolute point in UTC time.

Can I convert multiple timestamps at once?

Yes, use the Batch Conversion mode to paste multiple timestamps (one per line) and format them all simultaneously.

Unix Timestamp Converter - Epoch to Date & Date to Epoch

Unix Timestamp Converter

Convert Unix timestamps to readable dates and back in real time, with a live epoch clock, timezone support, and automatic seconds/milliseconds detection.

Human Readable Time	Total Seconds
1 Hour	3600 Seconds
1 Day	86400 Seconds
1 Week	604800 Seconds
1 Month (30.44 days)	2629743 Seconds
1 Year (365.24 days)	31556926 Seconds

Human Readable Time

Total Seconds

1 Hour

3600 Seconds

1 Day

86400 Seconds

1 Week

604800 Seconds

1 Month (30.44 days)

2629743 Seconds

1 Year (365.24 days)

31556926 Seconds

Language / Environment	Get Current Timestamp	Convert Timestamp to Date
JavaScript / Node.js	Math.floor(Date.now() / 1000)	new Date(ts * 1000).toUTCString()
Python	import time; int(time.time())	datetime.fromtimestamp(ts, tz=timezone.utc)
PHP	time()	date('Y-m-d H:i:s', $ts)
Java	System.currentTimeMillis() / 1000	Instant.ofEpochSecond(ts)
Go (Golang)	time.Now().Unix()	time.Unix(ts, 0).UTC()
SQL (MySQL / Postgres)	UNIX_TIMESTAMP() / extract(epoch from now())	FROM_UNIXTIME(ts) / to_timestamp(ts)

Language / Environment

Get Current Timestamp

Convert Timestamp to Date

JavaScript / Node.js

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

new Date(ts * 1000).toUTCString()

Python

import time; int(time.time())

datetime.fromtimestamp(ts, tz=timezone.utc)

PHP

time()

date('Y-m-d H:i:s', $ts)

Java

System.currentTimeMillis() / 1000

Instant.ofEpochSecond(ts)

Go (Golang)

time.Now().Unix()

time.Unix(ts, 0).UTC()

SQL (MySQL / Postgres)

UNIX_TIMESTAMP() / extract(epoch from now())

FROM_UNIXTIME(ts) / to_timestamp(ts)

What a Unix Timestamp Represents

A Unix timestamp, also called Epoch time or POSIX time, counts the total number of seconds that have elapsed since 1 January 1970 00:00:00 UTC, excluding leap seconds. Because it is a single number tied to UTC rather than any local clock, it gives every server, database, and API a shared, timezone-independent reference point for the same instant in time.

Seconds, Milliseconds, and the Year 2038 Limit

A 10-digit timestamp such as 1700000000 measures seconds and is standard in PHP's time(), Python's time.time(), and MySQL, while a 13-digit timestamp such as 1700000000000 measures milliseconds and is standard in JavaScript's Date.now(). Systems that still store Epoch time as a 32-bit signed integer will overflow at 03:14:07 UTC on 19 January 2038, a limitation known as the Year 2038 Problem that 64-bit systems avoid entirely.

Conversion Example

The timestamp 1700000000 converts to Tuesday, 14 November 2023, 22:13:20 UTC, with the ISO 8601 form 2023-11-14T22:13:20.000Z. Switching the timezone selector to a zone like Asia/Kolkata (UTC+5:30) recalculates the same absolute instant into 15 November 2023, 03:43:20 local time without changing the underlying timestamp value.

When to Use Related Developer Tools

Use the Regex Tester to extract timestamp patterns from raw log files before converting them, the JSON Formatter to clean up API responses that embed Epoch timestamps in their fields, and the Base64 Encoder/Decoder when timestamps are packed inside encoded tokens or session identifiers.

Convert Timestamp to Date

Enter a Date & Time

What is a Unix Timestamp (POSIX Epoch Time)?

Human Readable Time to Seconds Conversion Reference

How to Get & Convert Timestamps in Popular Languages

10-Digit Seconds vs. 13-Digit Milliseconds & ISO 8601

⏱️ 10-Digit Seconds (Epoch)

⚡ 13-Digit Milliseconds

🌐 ISO 8601 String

What is the Year 2038 Problem (Y2K38)?

AI Developer Advisor

How Unix Timestamp and Epoch Conversion Work

What a Unix Timestamp Represents

Seconds, Milliseconds, and the Year 2038 Limit

Conversion Example

When to Use Related Developer Tools

Questions, answered

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