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POSIX / IEEE 1003.1 Compliant
boltSub-Millisecond Precision (s, ms, µs, ns)
Live Epoch Ticker Active
Chronometric Computation Suite // Spec 2025.4

Unix Timestamp Converter

High-precision epoch time conversion across seconds, milliseconds, microseconds, nanoseconds, and ISO-8601. Engineered for backend developers, DevOps engineers, distributed systems architects, and cryptographic protocol specialists.

Seconds (s)10 Digits
1791190108
Unix Standard
Milliseconds (ms)13 Digits
1791190108518
JS / Node / Java
Microseconds (µs)16 Digits
1791190108518481
PostgreSQL / C++
Nanoseconds (ns)19 Digits
1791190108518481912
Go / Rust / HFT
Live ISO-8601 UTCZulu Time
2026-10-05T08:48:28.518Z
Standard RFC 3339
01
Conversion Mode SliderStep 01 of 03
Unix Timestamp → Human Date
schedule01
Active Mode

Unix Timestamp → Human Date

Epoch seconds, milliseconds, microseconds, nanoseconds to formatted UTC and local date

calendar_month02
Slide Here

Human Date & Time → Unix Timestamp

Calendar date, 12h/24h clock time, and timezone to Unix epoch integer seconds and millis

terminal03
Slide Here

ISO-8601 & RFC 3339 Parser

Deconstruct ISO strings, UTC Zulu z-times, and custom GMT timezone offsets

Primary Input Stream
Detected: Seconds (10 digits)
Precision Unit Resolution
expand_more
Execution Actions
Fast Telemetry Presets
calendar_today
Universal POSIX ReferenceEpoch benchmark: 1970-01-01T00:00:00.000Z · Gregorian calendar synchronization
Read Specsarrow_forward
Human Date & Time (UTC)2 years ago
Thursday, September 19, 2024 at 11:04:02 AM UTC
Projected (UTC): Thursday, September 19, 2024 at 11:04:02 AM UTC
Universal Representation Matrix
ISO 8601 / RFC 33392024-09-19T11:04:02.000Z
RFC 2822 FormatThu, 19 Sep 2024 11:04:02 GMT
Unix Epoch (Seconds)1726743842
Unix Epoch (Milliseconds)1726743842000
Unix Epoch (Microseconds)1726743842000000
Hexadecimal Representation0x66EC0522
Binary Byte Stream (32-bit)01100110 11101100 00000101 00100010
Day of Year:Day 263 of 366 (Leap Year)
ISO Week Number:Week 38
Julian Day Number (JD):2460572.9611
Engineered Developer Matrix

Programming Language Cheat Sheet

Production-tested implementation patterns for current epoch extraction and bidirectional string hydration across top runtime systems. Fully styled for dark and light modes.

paletteTheme:
10 Environments
JavaScript / TypeScriptNode.js / Web
epoch.tsUTC Ready
// Get current Unix timestamp (seconds)
const unixSec = Math.floor(Date.now() / 1000);

// Convert timestamp to ISO string
const date = new Date(1726743842 * 1000).toISOString();
Python 3Python 3.8+
epoch.pyUTC Ready
import time
from datetime import datetime, timezone

# Current Unix timestamp
now_epoch = int(time.time())

# Format to UTC datetime object
dt = datetime.fromtimestamp(1726743842, tz=timezone.utc)
Go (Golang)Go 1.18+
epoch.goUTC Ready
import "time"

// Current Unix epoch (seconds & nanoseconds)
nowSec := time.Now().Unix()
nowNano := time.Now().UnixNano()

// Convert Unix seconds to time.Time (UTC)
t := time.Unix(1726743842, 0).UTC()
RustRust 2021
main.rsUTC Ready
use std::time::{SystemTime, UNIX_EPOCH};

// Current Unix epoch in seconds
let sec = SystemTime::now()
    .duration_since(UNIX_EPOCH)
    .expect("Clock drifted backwards")
    .as_secs();
PHPPHP 8.x
epoch.phpUTC Ready
// Get current Unix timestamp
$timestamp = time();

// Convert timestamp to formatted UTC date
$isoDate = gmdate('Y-m-d\TH:i:s\Z', 1726743842);
Java 8+ (java.time)Java SE 8+
EpochDemo.javaUTC Ready
import java.time.Instant;

// Current epoch seconds & millis
long epochSec = Instant.now().getEpochSecond();
long epochMs  = Instant.now().toEpochMilli();

// Rehydrate Instant object from epoch
Instant instant = Instant.ofEpochSecond(1726743842L);
C# (.NET).NET 8.0
Program.csUTC Ready
// Get current Unix epoch seconds
long epochSec = DateTimeOffset.UtcNow.ToUnixTimeSeconds();

// Parse Unix seconds to DateTimeOffset
DateTimeOffset dto = DateTimeOffset.FromUnixTimeSeconds(1726743842);
RubyRuby 3.x
epoch.rbUTC Ready
# Current Unix seconds
now_sec = Time.now.to_i

# Convert timestamp to UTC Time object
utc_time = Time.at(1726743842).utc
SQL (PostgreSQL & MySQL)ANSI SQL
query.sqlUTC Ready
-- PostgreSQL: Extract seconds & convert
SELECT EXTRACT(EPOCH FROM NOW());
SELECT to_timestamp(1726743842);

-- MySQL: Extract seconds & convert
SELECT UNIX_TIMESTAMP();
SELECT FROM_UNIXTIME(1726743842);
Bash / POSIX ShellPOSIX Shell
epoch.shUTC Ready
# Print current epoch seconds
date +%s

# Convert specific timestamp to UTC RFC-2822
date -d @1726743842 -u
# macOS / BSD syntax: date -r 1726743842 -u
Architectural Metrology

Format Comparison & Precision Matrix

Detailed architectural breakdown of standard chronometry units utilized across operating systems, network layers, and database engines.

Unit LevelDigits LengthResolutionPrimary Runtimes & StacksBoundary Limits & Notes
Seconds (s)10 Digits1 second (100 s)POSIX C APIs, Linux Kernel, PHP, Python `time.time()`, MySQL32-bit signed limits at 2,147,483,647 (Y2038). 64-bit safe for billions of years.
Milliseconds (ms)13 Digits10-3 secondsJavaScript (`Date.now()`), Java (`currentTimeMillis`), MongoDBStandard in browser and web service payloads. Exceeds 32-bit width.
Microseconds (µs)16 Digits10-6 secondsPostgreSQL (`TIMESTAMP`), Redis telemetry, Linux `gettimeofday`Ideal for distributed microservice span tracing and database transaction logs.
Nanoseconds (ns)19 Digits10-9 secondsGo (`UnixNano()`), Rust `SystemTime`, High-Frequency Trading (HFT)Mandatory for PTP hardware clocks, network telemetry, and kernel profiling.
ISO-8601 / RFC 333920-27 CharsArbitrary decimal secondsREST APIs, GraphQL, OpenAPI specs, JSON schemasHuman-readable, unambiguous UTC zero-offset or explicit timezone declarations.
Hex Epoch (0x)8 or 16 Chars1 second / variableMongoDB ObjectID header (first 4 bytes), low-level memory tracesCompact byte representation for binary protocols and high-throughput serialization.
Authoritative Technical Documentation

The Architecture of Unix Chronometry

A comprehensive systems engineering study covering the genesis of Epoch 0, leap second handling, the physics of atomic clocks, and the 2038 signed rollover.

01

Genesis of January 1, 1970 00:00:00 UTC

The Unix Epoch benchmark was established during the developmental phases of the Unix operating system at Bell Laboratories by Dennis Ritchie and Ken Thompson. Originally conceived in the 1971 Unix Programmer's Manual as measuring 60-Hz ticks from the beginning of 1971, the definition was rapidly standardized to whole International System of Units (SI) seconds starting precisely at midnight UTC on Thursday, January 1, 1970.

This uniform baseline enabled lightweight hardware arithmetic on 32-bit processors (such as the PDP-11) without necessitating intricate calendar lookups, day-of-month calculations, or leap year algorithms in core kernel routines.

02

The Year 2038 Overflow Boundary

The Year 2038 problem (Y2038 or the Epoch Rollover) affects programs implementing the traditional 32-bit signed integer representation (`time_t`). At precisely 03:14:07 UTC on Tuesday, 19 January 2038, the decimal counter reaches 2,147,483,647 (hexadecimal 0x7FFFFFFF).

Upon ticking to the next second, the sign bit inverts, cycling the counter to -2,147,483,648 (0x80000000), which interprets as 20:45:52 UTC on Friday, 13 December 1901. Modern microkernels, databases, and programming languages systematically resolve this via 64-bit integer standardizations, expanding operational headroom past 292 billion years.

03

Leap Seconds & POSIX Smearing

The standard POSIX / IEEE 1003.1 mandate specifies that every day must consist of exactly 86,400 seconds. However, Earth's rotational deceleration requires the International Earth Rotation and Reference Systems Service (IERS) to sporadically introduce leap seconds into Coordinated Universal Time (UTC).

Because a standard Unix timestamp cannot allocate an integer count to the 86,401st second (e.g. 23:59:60), POSIX implementations repeat the timestamp of second 86,400 or utilize "leap smearing" (introduced by Google and AWS NTP servers), which subtly decelerates or accelerates system clocks by tiny microsecond slices over a 24-hour window to preserve continuous monotonicity without clock step jumps.

warning

Critical Timestamp Pitfalls in Distributed Systems

1. Unit Dimensional Mismatch

Feeding a 10-digit second timestamp into JavaScript's new Date(ts) constructor without multiplying by 1,000 resolves to January 1970 instead of current dates.

2. Wall-Clock Drift & Non-Monotonicity

Unix wall clocks (CLOCK_REALTIME) can drift or jump backwards during NTP synchronizations. For interval benchmarking, distributed consensus engines mandate monotonic clocks (CLOCK_MONOTONIC).

3. Daylight Saving (DST) Offsets

Unix timestamps are fundamentally absolute UTC representations immune to geographic timezones. Ambiguities only occur during string hydration and parsing if the offset header is lost.

Knowledge Base

Frequently Asked Questions

Exhaustive answers to architectural, mathematical, and implementation queries regarding Unix timestamps and timekeeping.