Free online unit, format, and data converters - timestamps, timezones, colour formats, number bases, units of measurement, file formats, and more. The Timestamp Converter translates between Unix epoch timestamps and human-readable dates in any timezone. The Timezone Converter shows equivalent times across multiple global timezones simultaneously for scheduling meetings across teams. The Unit Converter handles length, weight, temperature, volume, speed, and area with full SI and imperial support. The Number Converter switches between binary, octal, decimal, and hexadecimal. Colour format converters translate between HEX, RGB, HSL, CMYK, and OKLCH.

When to use Converters

1Backend development: convert Unix timestamps returned by APIs or databases into readable dates, or convert human-readable dates to epoch integers for storage.
2International scheduling: use the Timezone Converter to find a meeting time that works across UTC, EST, GMT, IST, AEST, and other timezones - with DST handled automatically.
3Design workflows: convert colour values between HEX (for CSS), RGB (for design tools), HSL (for colour adjustments), and CMYK (for print) without manual calculation.
4Embedded and low-level programming: use the Number Converter to convert between decimal, binary, octal, and hexadecimal when working with memory addresses, bit masks, and hardware registers.
5Science and engineering: convert between SI and imperial units for length, mass, volume, temperature, and pressure when working with international specifications or legacy documentation.

Frequently Asked Questions

What is a Unix timestamp?+

A Unix timestamp is the number of seconds that have elapsed since 00:00:00 UTC on 1 January 1970 (the Unix epoch). It is the standard way to store dates and times in databases and APIs because it is timezone-independent, compact, and easy to compare and sort. The Timestamp Converter translates between Unix timestamps and human-readable dates in any timezone.

How do I convert between timezones accounting for Daylight Saving Time?+

DST shifts clocks forward in spring and back in autumn in participating regions. The Timezone Converter uses the IANA timezone database to apply the correct DST rules for any date - so 9am EST in summer correctly shows as 14:00 UTC, while in winter it shows as 14:00 UTC (5 hours difference rather than 4). Always specify the exact date when converting across DST transitions.

What is OKLCH and how is it different from HSL?+

OKLCH is a perceptually uniform colour space where equal numeric changes produce equal perceived brightness differences - unlike HSL where a blue and a yellow at the same lightness value appear very different in brightness to the human eye. OKLCH is the recommended format for building accessible colour systems and is natively supported in modern CSS.

How do I convert a hex colour to RGB in CSS?+

CSS accepts both formats natively: color: #ff6a1a and color: rgb(255, 106, 26) are equivalent. The Colour Converter shows both values simultaneously for any input. In modern CSS you can also use oklch(0.67 0.19 31) for perceptually accurate colour manipulation.

About Converters

When to use Converters

1Backend development: convert Unix timestamps returned by APIs or databases into readable dates, or convert human-readable dates to epoch integers for storage.

2International scheduling: use the Timezone Converter to find a meeting time that works across UTC, EST, GMT, IST, AEST, and other timezones - with DST handled automatically.

3Design workflows: convert colour values between HEX (for CSS), RGB (for design tools), HSL (for colour adjustments), and CMYK (for print) without manual calculation.

4Embedded and low-level programming: use the Number Converter to convert between decimal, binary, octal, and hexadecimal when working with memory addresses, bit masks, and hardware registers.

5Science and engineering: convert between SI and imperial units for length, mass, volume, temperature, and pressure when working with international specifications or legacy documentation.

Frequently Asked Questions

What is a Unix timestamp?+

How do I convert between timezones accounting for Daylight Saving Time?+

What is OKLCH and how is it different from HSL?+

How do I convert a hex colour to RGB in CSS?+