Unix Timestamp & Epoch Converter

What is Unix Epoch Time and Why is it the Universal Computing Standard?

Unix Epoch Time (also referred to as POSIX time, Epoch seconds, or Unix timestamp) is the universal time representation used across computer operating systems, databases, distributed networks, and modern cloud infrastructure. It measures the precise number of elapsed non-leap seconds since the synchronization baseline: Thursday, January 1, 1970 at 00:00:00 Coordinated Universal Time (UTC).

Representing timestamps as an incremental integer completely removes the friction of calendar complexities, daylight saving time (DST) shifts, timezones, and regional formatting differences (such as MM/DD/YYYY vs DD/MM/YYYY). When your PostgreSQL, MongoDB, or Redis database stores 1739260800, that integer signifies the exact same instant whether read on a server in Tokyo, London, or San Francisco.

Unix Timestamp Time Units & Magnitude Reference Table

Depending on your language or execution context, timestamps are represented in varying granularities:

How to Get Current Timestamp in Major Programming Languages

// Milliseconds (13 digits)
const ms = Date.now();

// Seconds (10 digits)
const sec = Math.floor(Date.now() / 1000);

import time
from datetime import datetime

# Epoch seconds (float/int)
sec = int(time.time())

# From timestamp to datetime
dt = datetime.fromtimestamp(sec)

package main
import "time"

func main() {
  sec := time.Now().Unix()       // 10 digits
  nano := time.Now().UnixNano()  // 19 digits
}

// Epoch seconds
$sec = time();

// Format to ISO 8601
$iso = date(DATE_ATOM, $sec);

The Year 2038 Problem (Y2K38): Causes and Mitigations

Historically, 32-bit Unix operating systems stored timestamp integers using the time_t signed 32-bit integer data type. The maximum value that can be represented by a signed 32-bit integer is 2,147,483,647.

On Tuesday, January 19, 2038 at 03:14:07 UTC, 32-bit systems will encounter an integer overflow, causing the counter to roll over to -2,147,483,648, which translates backward to December 13, 1901. Modern operating systems (64-bit Linux, macOS, modern Windows kernels) and 64-bit databases represent timestamps with 64-bit integers (int64), raising the overflow limit to approximately 292 billion years in the future.

Frequently Asked Questions (FAQ)