ISO 8601 Date & Timestamp Converter

Convert dates and Unix timestamps to ISO 8601 (and back). Useful for APIs, logs, and UTC normalization — runs in your browser.

Introduction

ISO 8601 Date & Timestamp Converter is a free, browser-based utility in our Date & Time Tools collection. Paste an ISO 8601 string, Unix timestamp, or date/time and get UTC ISO, local ISO-like, date-only, and Unix outputs — ready to copy for APIs and logs. This ISO 8601 date and timestamp converter normalizes flexible inputs into portable ISO formats. Convert Unix seconds or milliseconds, ISO strings, and local date/time for API payloads, logs, and UTC checks. Everything runs locally in your browser — inputs stay on your device, with no account or upload required. Highlights include parse iso strings, unix timestamps, and date text.

Features

Parse ISO strings, Unix timestamps, and date text
UTC ISO 8601 and local ISO-like outputs
Unix seconds and milliseconds
Date picker plus flexible text input
One-click copy for each format

How to use

1
Paste an ISO string, Unix timestamp, or date — or use the local picker.
2
Copy the ISO, Unix, or display format you need.

Example

Unix ms

Input

1717200000000

Output

2024-06-01T00:00:00.000Z

Benefits

Run ISO 8601 entirely in the browser with no signup or installation.
Keep sensitive sample data private — processing never leaves your device.
Parse ISO strings, Unix timestamps, and date text
UTC ISO 8601 and local ISO-like outputs
Unix seconds and milliseconds
Pair it with Timestamp Converter and Timezone Converter when your workflow needs adjacent utilities.

FAQs

You’ll see an error if the input cannot be parsed.

UTC ISO (with Z) and a local ISO-like form are both shown, plus Unix timestamps.

Numeric inputs under 1e12 are treated as seconds; larger values as milliseconds.

Yes. ISO 8601 on EverydayDevTools is free, with no account, watermarks, or usage caps for normal interactive use.

No. ISO 8601 runs in your browser. Your input is processed locally and is not sent to EverydayDevTools servers.

Paste an ISO 8601 string, Unix timestamp, or date/time and get UTC ISO, local ISO-like, date-only, and Unix outputs — ready to copy for APIs and logs. It fits everyday date & time tools tasks when you want a fast local utility instead of installing a CLI or opening a heavy IDE feature.

Core capabilities include: Parse ISO strings, Unix timestamps, and date text; UTC ISO 8601 and local ISO-like outputs; Unix seconds and milliseconds; Date picker plus flexible text input.

Developers often pair ISO 8601 with Timestamp Converter, Timezone Converter, Date Diff. Open Related tools on this page for quick links.