Convert Unix timestamps to human-readable dates and back. Free tool for developers, log analysis, and database work. Instant results.

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Unix Timestamp Converter: Translate Seconds to Real Dates

Computers count time in seconds, not calendar days.
A Unix timestamp looks like 1743849600, which means nothing to most people.
A reliable Unix timestamp converter turns those numbers into readable dates instantly.

You do not need to write complex formulas.
Just paste the timestamp, and you get the exact date and time.
The tool works both ways, converting dates back to timestamps too.

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What Is a Unix Timestamp?

A Unix timestamp counts seconds since January 1, 1970.
This date is called the Unix Epoch.
Every second after that increases the number by one.

For example, 86400 seconds equals one full day.
One year equals approximately 31,536,000 seconds.
Computers use this system because it is simple and universal.

Why 1970?

Early Unix developers chose this date arbitrarily.
January 1, 1970, was a convenient starting point.
Nearly every operating system now uses this same system.

Core Functions of a Good Converter

• Converts timestamp to human-readable date
• Converts date and time back to timestamp
• Handles milliseconds for modern applications
• Supports timezone conversion

Our tool does all of this instantly.
No complex commands or programming needed.

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Why You Need a Timestamp Converter

Timestamps appear everywhere in computing.
Here is why you will use this tool often.

Debugging Log Files

Server logs show timestamps like 1743849600.
Finding an error at 3:00 AM is hard with raw numbers.
Convert to read the exact time of each event.

Working with APIs

Many APIs return timestamps instead of dates.
Weather data, social media posts, and payment records all use them.
Convert to understand when events actually happened.

Database Queries

SQL databases store timestamps for every record.
You need to filter records between two dates.
Convert your dates to timestamps first for accurate queries.

Cookie Expiration

Browser cookies use timestamps for expiration.
You set a cookie to expire in 30 days.
Convert that to a timestamp to verify your code.

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How to Use Our Unix Timestamp Converter

The tool works in two directions.
Follow these steps for your specific need.

Converting Timestamp to Date

1. Enter the Unix timestamp number.
2. Select your preferred timezone.
3. Click convert.
4. View the human-readable date and time.

The tool shows both local time and UTC.
You also see the day of the week.
Millisecond timestamps are detected automatically.

Converting Date to Timestamp

1. Enter the date and time using the picker.
2. Select your timezone.
3. Click convert.
4. Copy the resulting timestamp number.

You can type dates manually or use the calendar.
The tool supports dates from 1901 to 2038.
That covers almost all real-world use cases.

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Understanding Timestamp Formats

Not all timestamps look the same.
Here are the common formats you will encounter.

Seconds (10 digits)

Example: 1743849600
Used for: Standard Unix systems, log files
Range: 1970 to 2038 (32-bit systems)

This is the original timestamp format.
Most programming languages use seconds by default.

Milliseconds (13 digits)

Example: 1743849600000
Used for: JavaScript, Java, modern APIs
Range: More precise than seconds

JavaScript’s Date.now() returns milliseconds.
Our tool detects this format automatically.

Microseconds (16 digits)

Example: 1743849600000000
Used for: Python, high-precision systems
Range: Very detailed timing

Microseconds appear in scientific computing.
Our converter handles them without issues.

Nanoseconds (19 digits)

Example: 1743849600000000000
Used for: Go, Rust, performance testing
Range: Extreme precision

Nanoseconds are rare outside system programming.
Our tool supports them but rounds to milliseconds for display.

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Real-World Examples

Seeing actual conversions makes the value clear.
Here are common scenarios with correct results.

Example 1: Server Log Analysis

Timestamp: 1743849600
Converted: April 5, 2026, 12:00:00 UTC
Use case: Finding when a server error occurred

Example 2: API Response

Timestamp: 1704067200
Converted: January 1, 2024, 00:00:00 UTC
Use case: Understanding when a user account was created

Example 3: Cookie Expiration

Current timestamp: 1743849600
Expiration (30 days later): 1746441600
Converted expiration date: May 5, 2026

Example 4: Database Filter

Need records from: March 1, 2026
Converted to timestamp: 1740787200
SQL query: WHERE created_at > 1740787200

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Timezone Handling Explained

Timestamps are always in UTC (Coordinated Universal Time).
But you probably want your local time zone.
Here is how our tool handles this difference.

UTC (Universal Time)

UTC never changes for daylight savings.
All Unix timestamps are stored in UTC.
This prevents confusion across different time zones.

Local Time Conversion

Our tool converts UTC to your computer’s timezone.
If you are in New York, UTC-4 shows correctly.
If you are in Tokyo, UTC+9 shows correctly.

Important Note

The timestamp value never changes.
Only the displayed date adjusts for timezone.
A timestamp means the same moment everywhere on Earth.

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Unix Timestamp for Developers

If you write code, you need timestamps constantly.
Here is how to use them in popular languages.

JavaScript

javascript

// Get current timestamp in milliseconds
Date.now()  // Returns 1743849600000

// Convert timestamp to date
new Date(1743849600000)  // Returns Date object

// Convert date to timestamp
new Date('2026-04-05').getTime()  // Returns milliseconds

Python

python

import time
import datetime

# Get current timestamp
time.time()  # Returns 1743849600.123

# Convert timestamp to date
datetime.datetime.fromtimestamp(1743849600)

# Convert date to timestamp
datetime.datetime(2026, 4, 5).timestamp()

PHP

php

// Get current timestamp
time();  // Returns 1743849600

// Convert timestamp to date
date('Y-m-d H:i:s', 1743849600);

// Convert date to timestamp
strtotime('2026-04-05 12:00:00');

SQL (MySQL)

sql

-- Get current timestamp
UNIX_TIMESTAMP();

-- Convert timestamp to date
FROM_UNIXTIME(1743849600);

-- Convert date to timestamp
UNIX_TIMESTAMP('2026-04-05 12:00:00');

Our tool saves you from writing these functions.
Just paste and copy the result instantly.

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The Year 2038 Problem

You may have heard about the Year 2038 problem.
Here is what it means for timestamps.

What Is the Problem?

32-bit systems store timestamps in 32 bits.
The maximum value is 2,147,483,647.
That timestamp corresponds to January 19, 2038.

What Happens in 2038?

On 32-bit systems, the timestamp overflows.
It wraps around to December 13, 1901.
Dates will appear 137 years in the past.

Is This Still a Problem?

Most modern systems use 64-bit timestamps.
64-bit timestamps last for 292 billion years.
But embedded devices (cars, medical equipment) may still use 32-bit.

Our tool works with both formats.
It will not break in 2038 or any year after.

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Common Mistakes and Misconceptions

Timestamp conversion confuses many developers.
Here are the most frequent errors.

Mistake 1: Forgetting Milliseconds

A 13-digit number is milliseconds, not seconds.
Divide by 1000 before converting if needed.
Our tool detects this automatically.

Mistake 2: Ignoring Timezone

Timestamps are always UTC.
Do not add or subtract timezone offsets manually.
Our tool handles the conversion for you.

Mistake 3: Using Invalid Ranges

Timestamps before 1970 are negative numbers.
Not all systems support negative timestamps.
Our tool works with them, but your database might not.

Mistake 4: Confusing Epoch Start

The Unix epoch is January 1, 1970, UTC.
Not January 1, 1970, in your local time.
This is a common off-by-timezone error.

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Batch Timestamp Conversion

Need to convert many timestamps at once?
Here is how to do it efficiently.

Using Our Tool for Batch Work

Our tool converts one timestamp at a time.
For large batches, use a spreadsheet.

Spreadsheet Method

Paste timestamps into column A.
In column B, enter: =A1/86400 + DATE(1970,1,1)
Format column B as a date.

Command Line Method (Linux/Mac)

bash

# Convert timestamp to date
date -r 1743849600

# Convert date to timestamp
date -j -f "%Y-%m-%d %H:%M:%S" "2026-04-05 12:00:00" +%s

For more than 10 timestamps, use a script.
For occasional conversions, bookmark our tool.

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Frequently Asked Questions (FAQs)

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Conclusion

Unix timestamps are everywhere in computing.
But raw seconds are hard for humans to read.
A reliable Unix timestamp converter bridges that gap instantly.

Our tool converts both directions with one click.
It handles seconds, milliseconds, and all timezones.
Stop guessing what 1743849600 means.