JsonifyTools
    Live Conversion · 100% Local · Zero Upload

    Timestamp Converter

    Convert, compare, and generate Unix timestamps — with timezone support, dev formats, and range building, all processed privately in your browser.

    Live Unix1781958458
    Everything processed locally 14 timezones supported
    Unix Timestamp
    ↕ bidirectional
    Date & Time
    Converted Formats
    ISO 8601
    —
    UTC
    —
    Local
    —
    Relative
    —

    Quick Reference

    Seconds10 digits
    Milliseconds13 digits
    Unix EpochJan 1, 1970
    Max 32-bit2147483647
    Time Reference

    Everything You Need to Know About Unix Timestamps

    From API debugging to log analysis to JWT expiration — Unix timestamps are the universal language of time in software. Here's how they work, when to use each format, and how this tool handles every scenario.

    Live Conversion

    Output updates instantly as you type — bidirectional Unix ↔ date sync.

    100% Client-Side

    Nothing is uploaded. All conversions run in your browser sandbox.

    14 Timezones

    View the same moment in UTC, EST, JST, IST, and more with one click.

    Dev Formats

    MySQL, MongoDB, Python, JavaScript, Swift, CloudWatch — copy-ready.

    What is a Unix Timestamp?

    A Unix timestamp is an integer representing the number of seconds elapsed since the Unix Epoch — January 1, 1970 00:00:00 UTC. It is the most widely used time representation in computing because it is compact, sortable, timezone-neutral, and universally understood across languages and platforms.

    Unlike human-readable dates, Unix timestamps have no ambiguity about format (MM/DD vs DD/MM), no daylight saving complications, and no timezone confusion. The integer 1704067200 means exactly the same moment everywhere in the world.

    Key Reference Values

    These landmark timestamps are useful for testing, validation, and understanding the range:

    Unix timestamp reference
    Epoch start     →  0           (1970-01-01 00:00:00 UTC)
Y2K             →  946684800   (2000-01-01 00:00:00 UTC)
Common test     →  1704067200  (2024-01-01 00:00:00 UTC)
32-bit max      →  2147483647  (2038-01-19 03:14:07 UTC)
Current (2025)  →  ~1740000000 (approx. Jun 2025)
Milliseconds    →  13 digits   (× 1000 from seconds)
    Live Examples

    Timestamp conversion examples — copy & try

    Select any example below, copy the input, and paste it into the converter above to verify.

    Input (Unix Timestamp)
    1704067200
    ISO 8601 Output
    2024-01-01T00:00:00.000Z

    💡 10-digit Unix timestamp in seconds. Paste into the converter above to see all formats instantly.

    Seconds vs Milliseconds — Which Format Is It?

    Misidentifying the format is the most common timestamp bug. Use digit count as your first check.

    FormatDigitsExampleUsed By
    Seconds101704067200Linux, Python time.time(), PostgreSQL, JWT exp, most APIs
    Milliseconds131704067200000JavaScript Date.now(), Java System.currentTimeMillis(), MongoDB
    Microseconds161704067200000000Python time.time_ns() / 1000, some logging systems
    Nanoseconds191704067200000000000Go time.Now().UnixNano(), high-precision profiling

    How to use this Timestamp Converter

    1

    Convert Tab

    Enter a Unix timestamp or pick a date — both fields sync bidirectionally. Click 'Now' for the current time. Select a timezone to see local representations.

    2

    Diff Tab

    Enter two timestamps A and B to calculate the exact difference in days, hours, minutes, and seconds. Swap button flips the inputs instantly.

    3

    Generate Tab

    Use quick presets (yesterday, next week, etc.) or set a custom offset. Bulk generate up to 100 timestamps at a regular interval.

    4

    Range Builder

    Set start and end timestamps to build a time range. Export as JSON, human-readable text, or get a cron expression suggestion.

    Where Timestamps Are Used
    • API responses — created_at, updated_at, expires_at fields
    • Database columns — PostgreSQL, MySQL, MongoDB store Unix or ISO dates
    • Server logs — Nginx, Apache, and application logs use Unix time
    • JWT tokens — exp and iat claims are Unix timestamps in seconds
    • Cron jobs — schedule tasks using Unix-based intervals
    • Analytics — event tracking, session duration, funnel timestamps
    • File systems — creation and modification times as epoch values
    • Caching — TTL and expiration headers use timestamp arithmetic
    Tool Features
    • Bidirectional Unix ↔ date conversion with live sync
    • Auto-detect seconds (10-digit) vs milliseconds (13-digit)
    • 14 IANA timezones — UTC, EST, PST, JST, IST, and more
    • Dev format exports — MySQL, MongoDB, Python, JS, Swift
    • Timestamp diff calculator with human-readable breakdown
    • Quick presets and bulk timestamp generation
    • Range builder with JSON export and cron suggestions
    • 100% browser-based — no data leaves your device
    Code Examples

    Converting Timestamps in Popular Languages

    Copy these snippets for your project. Remember: most languages use seconds, but JavaScript uses milliseconds.

    timestamp-conversionMulti-language
    // JavaScript — uses milliseconds
const date = new Date(1704067200 * 1000);
date.toISOString();  // "2024-01-01T00:00:00.000Z"
Math.floor(Date.now() / 1000);  // current Unix (seconds)

# Python
from datetime import datetime, timezone
datetime.fromtimestamp(1704067200, tz=timezone.utc)
# 2024-01-01 00:00:00+00:00
int(datetime.now(timezone.utc).timestamp())  # current Unix

// Go
time.Unix(1704067200, 0).UTC().Format(time.RFC3339)
// "2024-01-01T00:00:00Z"

# MySQL
SELECT FROM_UNIXTIME(1704067200);
# 2024-01-01 00:00:00

// Swift
Date(timeIntervalSince1970: 1704067200)
// 2024-01-01 00:00:00 +0000
    The Year 2038 Problem

    Systems using 32-bit signed integers to store Unix timestamps will overflow on January 19, 2038 at 03:14:07 UTC when the value exceeds 2,147,483,647. The counter wraps to a negative number, causing dates to jump back to December 13, 1901 — a problem analogous to Y2K.

    Affected

    32-bit embedded systems, legacy databases, old C/C++ applications using time_t on 32-bit platforms.

    Safe

    64-bit Linux, macOS, Windows, modern Node.js, Python 3, Go, and all major cloud databases.

    Fix

    Migrate to 64-bit time_t, use BIGINT columns in databases, and audit any code casting timestamps to int32.

    💡 Use the Range Builder tab to calculate durations and verify your systems handle timestamps beyond 2038 correctly.

    Understanding Timezones & Unix Time

    Unix timestamps are always UTC — they represent an absolute point in time with no timezone offset. When you see a timestamp converted to "2024-06-15 14:30:00 EDT" vs "2024-06-15 18:30:00 UTC", both refer to the same moment; only the display format differs.

    Same timestamp, different timezones
    Unix timestamp: 1718451000

UTC:              2024-06-15T11:30:00Z
America/New_York: 6/15/2024, 7:30:00 AM  (EDT, UTC-4)
Europe/London:    6/15/2024, 12:30:00 PM (BST, UTC+1)
Asia/Tokyo:       6/15/2024, 8:30:00 PM  (JST, UTC+9)
Asia/Kolkata:     6/15/2024, 5:00:00 PM  (IST, UTC+5:30)

    Always store timestamps in UTC in your database. Convert to local timezone only at the display layer — never store timezone-adjusted integers.

    Unix Timestamp vs ISO 8601 — When to Use Each
    AspectUnix TimestampISO 8601
    FormatInteger (1704067200)String (2024-01-01T00:00:00Z)
    Size4–8 bytes (compact)20+ bytes (verbose)
    Human readableNo — requires conversionYes — immediately readable
    SortableYes — numeric sort worksYes — lexicographic sort works
    Timezone infoImplicit UTC onlyExplicit (Z or +05:30 offset)
    Best forDatabases, logs, APIs, JWTJSON APIs, config files, documentation

    Complete Feature Set

    Everything a developer needs to work with timestamps — in one free, browser-based tool.

    Live Bidirectional Sync

    Type a Unix timestamp or pick a date — both fields update instantly in real time.

    Live Unix Clock

    See the current Unix timestamp updating every second at the top of the page.

    Timezone Selector

    Switch between 14 IANA timezones to see local, UTC, and ISO representations.

    Timestamp Diff

    Calculate exact differences between two timestamps in days, hours, minutes, and seconds.

    Quick Presets

    One-click presets: yesterday, tomorrow, next week, start/end of today, and more.

    Dev Format Exports

    Copy-ready formats for MySQL, MongoDB, DynamoDB, Python, JavaScript, and Swift.

    Frequently Asked Questions

    Common questions about Unix timestamps, timezones, and format conversion.