What is a Unix timestamp?

A Unix timestamp is the number of seconds (or milliseconds in some systems) elapsed since 00:00:00 UTC on 1 January 1970, known as the Unix epoch. It is timezone-independent and is the standard way to store and compare dates in databases, log files, APIs, and distributed systems.

Why does my cron job not run at the expected time?

Cron expressions are evaluated in the server's local timezone unless the scheduler explicitly supports IANA timezone identifiers. If your job runs an hour early or late after a daylight saving change, check whether the scheduler is using UTC or a local timezone. Use the cron expression builder to verify the next five run times and the timezone converter to cross-reference.

How does the unit converter handle temperature?

Temperature conversion is non-linear (it requires addition as well as multiplication), unlike length or weight which are simple ratios. The unit converter applies the correct formula for Celsius, Fahrenheit, and Kelvin conversions automatically.

What is the largest number the number-to-words tool supports?

The number-to-words converter supports integers and decimals up to 999 quadrillion (999,999,999,999,999). It also handles negative numbers and produces output in English following standard naming conventions.

Time & Number Tools | DevToolsForYou

11 free browser-based tools

Numbers and time values appear throughout developer work in formats that require translation — epoch timestamps in logs and database records, cron expressions in CI/CD pipelines, measurement units across engineering and science disciplines, and numeric representations for different locales and traditions. This set of tools covers Unix timestamp conversion, timezone arithmetic across all IANA identifiers, age and date-difference calculations, cron schedule building with plain-English descriptions, metric/imperial unit conversion, and several numeral system converters including number-to-words, Roman numerals, and Hindi (Devanagari) numerals.

Free online time and number tools — Unix timestamp converter, timezone converter, age calculator, cron expression builder, unit converter, number to words, Roman numeral converter, and more.

Unix Timestamp Converter

Convert Unix time to readable date formats and back.

Timezone Converter

Convert any date and time between world timezones with automatic daylight saving time awareness.

Number to Words Converter

Convert numbers to English words and English words back to numbers instantly.

Unit Converter

Convert between units of length, weight, temperature, volume, speed, and area instantly.

Currency Converter

Convert between 30+ currencies with live exchange rates updated daily.

Age Calculator

Calculate exact age from a date of birth — in years, months, weeks, days, hours, and minutes.

Retirement Calculator

Enter your date of birth to find out when you will retire at ages 40, 45, 50, 55, 58, and 60 — with exact dates and countdowns.

Roman Numeral Converter

Convert between Arabic numbers and Roman numerals instantly — supports 1 to 3999.

Cron Expression Builder & Parser

Build, parse, and validate cron expressions visually. See the human-readable schedule and upcoming run times instantly.

Percentage Calculator

Calculate percentages instantly — X% of Y, what percentage X is of Y, percentage change, and add/subtract a percentage.

Hindi Numeral Converter

Convert between Hindi (Devanagari) numerals and English (Arabic) numerals instantly.

Frequently asked questions

What is a Unix timestamp?: A Unix timestamp is the number of seconds (or milliseconds in some systems) elapsed since 00:00:00 UTC on 1 January 1970, known as the Unix epoch. It is timezone-independent and is the standard way to store and compare dates in databases, log files, APIs, and distributed systems.
Why does my cron job not run at the expected time?: Cron expressions are evaluated in the server's local timezone unless the scheduler explicitly supports IANA timezone identifiers. If your job runs an hour early or late after a daylight saving change, check whether the scheduler is using UTC or a local timezone. Use the cron expression builder to verify the next five run times and the timezone converter to cross-reference.
How does the unit converter handle temperature?: Temperature conversion is non-linear (it requires addition as well as multiplication), unlike length or weight which are simple ratios. The unit converter applies the correct formula for Celsius, Fahrenheit, and Kelvin conversions automatically.
What is the largest number the number-to-words tool supports?: The number-to-words converter supports integers and decimals up to 999 quadrillion (999,999,999,999,999). It also handles negative numbers and produces output in English following standard naming conventions.