# Unix Hex Timestamp Converter

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.

> Canonical page: https://elysiatools.com/en/tools/unix-hex-timestamp-converter

- **Category:** Development

- **Keywords:** unix hex timestamp, hex timestamp converter, timestamp to hex, hex to date, 0x timestamp, epoch hexadecimal, unix timestamp converter

## Overview

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.

## Inputs

- **Timestamp input** (text): 0x5F6B3A2F, 5F6B3A2F, 1601057839, 1601057839000, or a date
- **Hex byte order** (select)

## 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

- Enter 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.
- Select 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.
- The 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.

## Frequently asked questions

### 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.

## Related tools

- [UUID Version Generator (v1–v8)](https://elysiatools.com/en/tools/uuid-version-generator): Generate RFC 9562 UUIDs — including the modern v6, v7 and v8 that most generators lack — or decode any UUID back to its version, variant and embedded timestamp.
- [Date Format Unifier](https://elysiatools.com/en/tools/date-format-unifier): Convert various date formats to a unified format
- [Date Formatter](https://elysiatools.com/en/tools/date-formatter): Convert date strings to various formatted date formats
- [ISO 8601 Converter](https://elysiatools.com/en/tools/iso-8601-converter): Convert dates to and from ISO 8601 format
- [Timestamp Converter](https://elysiatools.com/en/tools/timestamp-converter): Convert between timestamps and human-readable dates
- [Audio Filler Word Removal Map](https://elysiatools.com/en/tools/audio-filler-word-removal-map): Combine a timestamped transcript with the audio to mark filler words (um, uh, 嗯, 那个…) and optionally mute or remove them.
- [Audio Read-Along Cue Generator](https://elysiatools.com/en/tools/audio-read-along-cue-generator): Generate sentence or word-level timestamp cues from a narration audio and its script, for karaoke-style reading and language learning.
- [Currency Exchange Calculator](https://elysiatools.com/en/tools/currency-exchange): Convert an amount between currencies using live exchange rates from a free, no-key API (open.er-api.com). Supports 160+ world currencies. Shows the converted amount, the exchange rate used, a comparison table against popular currencies, and the rate update timestamp.

## Samples

- [Hex/Unicode Encoding Format Samples](https://elysiatools.com/en/samples/text-hex-unicode-formats): Examples of hex (\xXX) and unicode (\uXXXX) escape sequence encoding formats
- [Web Image Processing Python Samples](https://elysiatools.com/en/samples/web-image-processing-python): Web Python image processing examples using PIL/Pillow including reading, saving, resizing, and format conversion
- [Android Image Processing Java Samples](https://elysiatools.com/en/samples/android-image-processing-java): Android Java image processing examples including reading/saving images, scaling, and format conversion
- [Android Image Processing Kotlin Samples](https://elysiatools.com/en/samples/android-image-processing-kotlin): Android Kotlin image processing examples including reading/saving images, scaling, and format conversion