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Unix Hex Timestamp Converter

· Last updated：2026-09-03

Convert Unix timestamps between hexadecimal and decimal/ISO — paste 0x5F6B3A2F, a bare 8-digit hex value, decimal seconds or milliseconds, or a date, and get every form back.

Details

What this tool helps you do

Unix timestamps show up in hexadecimal all over embedded logs, file formats, game replays and databases: 8 uppercase hex digits like 5F6B3A2F are seconds since 1970-01-01, and 11-digit hex values are milliseconds. Paste any of those — with or without the 0x prefix — or a decimal seconds/milliseconds value, or a plain date string, and the converter auto-detects the kind and prints the whole family: ISO 8601 UTC, decimal seconds, decimal milliseconds, uppercase 8-digit hex seconds (both bare and 0x-prefixed) and 11-digit hex milliseconds. A little-endian switch re-reads the hex bytes in reverse order for the formats that store timestamps byte-flipped. Inputs are range-checked against 1970 up to year 9999 so a typo like 5F6B3A2G or a garbage value is rejected with an explanation instead of producing a date in the Stone Age.

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Written by the Elysia Tools team

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Development
Input types
text, select
Output type
text
Sample coverage
4
API ready
Yes

Overview

The Unix Hex Timestamp Converter translates Unix epoch timestamps across hexadecimal, decimal, and human-readable ISO 8601 UTC formats. It auto-detects 8-digit hex seconds (with or without a 0x prefix), 11-digit hex milliseconds, decimal seconds or milliseconds, and date strings. Built-in byte order switching supports both big-endian and little-endian hex inputs, while range-checking rejects malformed strings and dates outside the 1970 to 9999 range.

When to use

  • Analyzing binary file headers, firmware dumps, or embedded device logs containing raw hex epoch values.
  • Parsing game replays or network packets where timestamps are encoded in little-endian byte order.
  • Converting human-readable dates or decimal timestamps into 8-digit uppercase hex values for database storage or low-level debugging.

How it works

  1. 1Enter a timestamp as an 8-digit hex value (e.g., 0x5F6B3A2F or 5F6B3A2F), 11-digit hex milliseconds, decimal epoch seconds/milliseconds, or a date string.
  2. 2Select the hex byte order: keep Big-endian for values written as-is, or select Little-endian to reverse the byte order for swapped binary representations.
  3. 3The tool validates the input against the 1970–9999 year range and outputs the ISO 8601 UTC date, decimal seconds, decimal milliseconds, bare hex, 0x-prefixed hex, and 11-digit hex milliseconds.

Use cases

  • Embedded systems debugging to decode 32-bit hex crash log timestamps into UTC timestamps.
  • Digital forensics and binary analysis to parse byte-flipped file creation or modification metadata.
  • API and protocol development to generate compact hexadecimal timestamps from standard date strings.

Examples

1. Decoding an Embedded Log Hex Timestamp

Firmware Engineer

Background

An IoT device log records event timestamps as 32-bit hexadecimal values in big-endian notation.

Problem

Convert a logged hex value 0x5F6B3A2F to determine the exact UTC date and decimal epoch time.

How to use

Enter 0x5F6B3A2F into the timestamp input and leave Hex byte order set to Big-endian.

Timestamp: 0x5F6B3A2F, Hex byte order: Big-endian

Outcome

Receives ISO 8601 UTC timestamp 2020-09-23T12:06:07.000Z along with decimal seconds (1601057839) and hex representations.

2. Parsing Little-Endian Timestamp from Binary Header

Reverse Engineer

Background

A custom binary file header contains a 4-byte timestamp stored in little-endian byte order as 2F3A6B5F.

Problem

Reading the hex string as big-endian produces an incorrect historical date from 1995 instead of the actual creation time.

How to use

Paste 2F3A6B5F into the timestamp field and select Little-endian (reverse bytes) under Hex byte order.

FAQ

What input formats does this converter support?

It accepts 8-digit hex seconds (bare or with a 0x prefix), 11-digit hex milliseconds, decimal seconds, decimal milliseconds, and standard date strings.

When should I switch the byte order to Little-endian?

Use Little-endian when reading timestamps extracted from binary structures or x86/ARM memory dumps where least significant bytes are stored first.

What is the difference between 8-digit and 11-digit hex timestamps?

An 8-digit hex value represents Unix time in seconds, while an 11-digit hex value represents high-precision Unix time in milliseconds.

Why is my hex value rejected with an error?

Inputs are rejected if they contain non-hex characters or resolve to dates before January 1, 1970, or after the year 9999.

Are timestamps converted to local time or UTC?

The primary formatted output is rendered in ISO 8601 UTC alongside all corresponding numerical epoch representations.

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Timestamp: 2F3A6B5F, Hex byte order: Little-endian

Outcome

Reverses the bytes to 5F6B3A2F and outputs the correct date 2020-09-23T12:06:07.000Z and decimal epoch 1601057839.

3. Converting Decimal Epoch to Hexadecimal

Backend Developer

Background

A microservice requires 8-digit hexadecimal timestamp IDs generated from Unix epoch timestamps.

Problem

Generate uppercase 8-digit bare hex and 0x-prefixed hex representations from a standard 10-digit decimal epoch.

How to use

Paste 1601057839 into the input field with Big-endian selected.

Timestamp: 1601057839, Hex byte order: Big-endian

Outcome

Outputs bare hex 5F6B3A2F, prefixed hex 0x5F6B3A2F, and 11-digit hex milliseconds alongside the UTC date.