Best Free Unix Timestamp Converters Compared - Epochconverter Alternatives

# Best Free Unix Timestamp Converters Compared - Epochconverter Alternatives

Why Timestamp Conversion Tools Still Matter in 2026

You would think that in a world of ISO 8601 strings and JavaScript Date objects, the Unix timestamp would have quietly retired. It has not. Almost every database, API, log aggregator, and JWT in production still stores dates as seconds-since-1970 integers. That means every backend developer ends up staring at a number like 1744545600 at some point and asking "what day is that?"

Epochconverter.com has been the default answer to that question for more than a decade. It works, it is free, and the URL is in muscle memory for a lot of developers. But it is one option among several, and the right choice depends on what you are actually trying to do with the timestamp.

This post compares the real Unix timestamp tools in 2026.

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What a Timestamp Converter Does

A Unix timestamp is the number of seconds that have elapsed since January 1, 1970 UTC (the Unix epoch). Converting it means:

• Taking the integer
• Adding it to the epoch
• Displaying the result in a readable date and time
• Handling the time zone correctly

That is it. Like JWT decoding, timestamp conversion is arithmetic that does not require a server round trip. Tools that send your timestamp to a server for conversion are doing the easy thing in the slowest way.

The nuance is in the format variations:

• Seconds since epoch: the traditional Unix timestamp. Integer, usually 10 digits for dates in the 2000s.
• Milliseconds since epoch: JavaScript Date.now() returns this. 13 digits.
• Microseconds and nanoseconds: used in high-precision systems, log aggregators like Datadog, and databases like TimescaleDB.
• Windows FILETIME: 100-nanosecond intervals since January 1, 1601. Different epoch.

A good converter handles all of these and auto-detects which format you pasted based on the digit count.

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The Comparison: 7 Timestamp Converters

1. Epochconverter.com

The incumbent. The URL is bookmarked in a lot of developer browsers.

What it does well:

• Shows the current Unix timestamp at the top of the page, constantly ticking
• Converts between timestamp and human date in both directions
• Supports seconds, milliseconds, microseconds, and nanoseconds
• Batch converter for multiple timestamps at once
• Reference section covering timestamps in various programming languages
• Free with no signup

What to know:

• Ad-supported. The interface is cluttered with banner ads and the layout has not changed in years.
• Some of the most-used features are below the fold on first visit.

Verdict: Still works, and the feature coverage is wide. If you can tolerate the ads, it is a reasonable default. The muscle memory alone keeps it in use for most developers.

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2. Unixtimestamp.com

A lighter-weight alternative with a cleaner interface.

What it does well:

• Simple conversion in both directions
• Supports seconds, milliseconds, microseconds, and nanoseconds
• Displays the current timestamp and auto-refreshes
• Minimal advertising compared to epochconverter.com

What to know:

• Fewer reference features than epochconverter.com
• No batch converter
• Limited programming-language reference content

Verdict: A cleaner daily driver if the reference tables on epochconverter.com are not useful to you.

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3. FreeFormatter Epoch Converter

Part of FreeFormatter's broader tools suite.

What it does well:

• Bidirectional conversion (timestamp to date, date to timestamp)
• Displays current timestamp in both seconds and milliseconds
• Supports multiple time zones in the output
• Integrates with FreeFormatter's other tools if you are already there

What to know:

• Ad-supported via Google AdSense, same as FreeFormatter's other tools
• The interface is a bit formal and dated

Verdict: Fine if you are already on FreeFormatter for another reason (their cron generator supports Quartz format, for example). Not a reason to switch your default.

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4. Epochutils.com

A cleaner, more modern alternative.

What it does well:

• Minimal ads
• Claims client-side processing
• Simple interface focused on the conversion

What to know:

• Smaller feature set than epochconverter.com
• Less well-known

Verdict: Worth a look if the visual clutter of older tools bothers you. Same functional core, cleaner wrapping.

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5. Unixtime.org

A developer-focused converter with language reference sections.

What it does well:

• Reference tables showing how to get the current timestamp in various languages (Python, Java, JavaScript, Ruby, PHP, Go, Rust, SQL, etc.)
• Bidirectional conversion
• Clean interface

What to know:

• Focused on timestamp-to-date conversion, fewer programmer-reference features than epochconverter
• Less well-known than the incumbents

Verdict: The language reference tables make it handy when you also want to remember how to generate a timestamp in whatever language you are currently in.

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6. Site24x7 Timestamp Converter

Part of Zoho's DevOps tools suite.

What it does well:

• Clean interface from a reputable company
• Handles seconds, milliseconds, and nanoseconds
• Supports time zone output

What to know:

• The timestamp converter is one small tool in a much larger DevOps product suite
• Not a lot of investment in the individual tool itself

Verdict: Functional but unremarkable.

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7. ToolBox Timestamp Converter

Full disclosure, this is our tool.

What it does:

• Converts between Unix timestamp (seconds and milliseconds) and human-readable date
• Shows the current Unix timestamp, auto-updating
• Displays the converted date in both UTC and local time
• Handles both seconds (10-digit) and milliseconds (13-digit) automatically
• All conversion runs in the browser. Nothing is sent to a server.
• Part of a suite of 150+ other tools
• No ads, no account, no funnel

The trade-off:

• No microsecond or nanosecond support today. If you need sub-millisecond precision, use epochconverter or unixtimestamp.com.
• No batch conversion for multiple timestamps at once.
• No Windows FILETIME conversion.

Verdict: Good fit for the most common case: "what does this 10-digit or 13-digit number mean as a date." If you need exotic formats (nanoseconds, FILETIME), epochconverter.com is still the most complete.

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Feature Comparison Table

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Which Tool for Which Job

"I just need to know what date this timestamp is."

Any tool in the table handles the basic case. ToolBox, Unixtime.org, and Epochutils.com have the cleanest interfaces.

"I need microsecond or nanosecond precision."

Epochconverter.com, Unixtimestamp.com, or Site24x7. They all handle the exotic formats.

"I want to paste a bunch of timestamps at once and get them all converted."

Epochconverter.com has the batch converter.

"I need to convert Windows FILETIME."

Epochconverter.com has a dedicated section for FILETIME. Few other tools do.

"I am working in a language I do not remember the date syntax for."

Unixtime.org has language reference tables.

"I want the timestamp converter next to my other debugging tools."

ToolBox keeps the Timestamp Converter in a sidebar with the JSON Formatter, JWT Decoder, and everything else.

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Common Timestamp Mistakes

Mistake 1: Seconds vs Milliseconds Confusion

This is the most common mistake. If you see a timestamp that decodes as a date in 56000 AD, you pasted a milliseconds value into a seconds converter. The fix is to divide by 1000, or paste it into a converter that auto-detects based on digit count (10 digits is seconds; 13 digits is milliseconds).

Mistake 2: Timezone Assumptions

A Unix timestamp is timezone-free. It represents an instant in time, not a "date" in any timezone. When you convert it to human-readable form, you pick a timezone to display it in. Two developers in different time zones looking at the same timestamp will see different wall-clock times, and that is correct.

Bugs happen when code assumes the display timezone is UTC when it is not, or vice versa. Always log with explicit timezone annotations in production.

Mistake 3: 32-Bit Overflow (Year 2038 Problem)

Unix timestamps stored as 32-bit signed integers overflow at 03:14:07 UTC on January 19, 2038. Systems that still use 32-bit time_t will break at that point. Most modern systems have moved to 64-bit, but older embedded systems, legacy databases, and some C code on 32-bit platforms have not. Worth checking if you work with anything that could still be running in 2038.

Mistake 4: Confusing Unix Epoch and NTP Epoch

The Unix epoch is January 1, 1970. The Network Time Protocol (NTP) epoch is January 1, 1900. Subtracting the two gives a fixed offset of 2208988800 seconds. If you are processing raw NTP packets and applying Unix timestamp logic to them, your dates will be 70 years off.

Mistake 5: Leap Seconds

Unix time does not account for leap seconds. Most of the time this does not matter. Occasionally it does: financial tick data, physics experiments, and astronomical calculations care. For everything else, the fiction that every day has exactly 86,400 seconds is close enough.

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Timestamps in Different Languages

Since the usual reason you open a timestamp converter is to then write code that generates or parses one, here is a quick reference:

# Bash
date +%s                             # current timestamp in seconds
date -r 1744545600                   # convert timestamp to date (Mac)
date -d @1744545600                  # convert timestamp to date (Linux)

# Python
import time
time.time()                          # current timestamp in seconds (float)
int(time.time())                     # current timestamp in seconds (int)

from datetime import datetime, timezone
datetime.now(timezone.utc).timestamp()
datetime.fromtimestamp(1744545600, tz=timezone.utc)

// JavaScript
Math.floor(Date.now() / 1000);       // current timestamp in seconds
Date.now();                          // current timestamp in milliseconds
new Date(1744545600 * 1000);         // convert seconds to Date

// Go
import "time"
time.Now().Unix()                    // current timestamp in seconds
time.Unix(1744545600, 0)             // convert seconds to time.Time

-- PostgreSQL
SELECT EXTRACT(EPOCH FROM NOW());              -- current timestamp in seconds
SELECT TO_TIMESTAMP(1744545600);               -- convert seconds to timestamp

-- MySQL
SELECT UNIX_TIMESTAMP();                       -- current timestamp in seconds
SELECT FROM_UNIXTIME(1744545600);              -- convert seconds to datetime

// Rust
use std::time::{SystemTime, UNIX_EPOCH};
SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_secs();

Memorize the ones for your daily languages and you will open timestamp converters less often.

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Try It Now

If you want a clean, fast timestamp converter next to the other tools you are probably using in the same debugging session (JSON, JWT, regex, diff), try the ToolBox Timestamp Converter. It handles seconds and milliseconds automatically, displays both UTC and local time, and sits in a suite with JSON Formatter, JWT Decoder, and Cron Expression Parser.

For microsecond or nanosecond precision, or for Windows FILETIME conversion, epochconverter.com is still the most complete. For language reference tables alongside the conversion, unixtime.org is a good bookmark.

The default choice depends on what you are actually pasting. For 10-digit and 13-digit numbers, almost any tool will do. For exotic formats, the older incumbents have wider coverage.