Time & Date
Unix timestamp converters, cron expression parsers, and timezone tools.
Popular in Time & Date
Unix Timestamp Converter
Convert Unix epoch seconds or milliseconds to human-readable dates and back.
ISO 8601 Converter
Parse and format ISO 8601 / RFC 3339 datetime strings.
Timezone Converter
Convert a date and time across world timezones using IANA names.
Cron Expression Parser
Explain cron expressions in plain English and list upcoming runs.
All Time & Date
Epoch Millisecond Converter
Convert JavaScript-style epoch milliseconds to dates and back.
UTC Offset Converter
Convert between UTC offsets like +05:30 and local wall times.
Cron Expression Generator
Build cron expressions from simple schedule choices.
Cron Humanizer
Turn cron syntax into a clear English description.
Cron Next Run Calculator
Calculate the next execution times for a cron expression.
Date Difference Calculator
Calculate the duration between two dates in days, hours, and more.
Date Add / Subtract Calculator
Add or subtract days, weeks, months, or years from a date.
Week Number Calculator
Find the ISO week number for any date.
Leap Year Checker
Check whether a year is a Gregorian leap year.
Business Day Calculator
Calculate the requested result instantly using browser-side logic.
Age Calculator
Calculate the requested result instantly using browser-side logic.
Relative Time Generator
Generate production-ready relative time output directly in the browser.
Duration Formatter
Format and normalize Duration content for readability and consistency.
Countdown Calculator
Calculate the requested result instantly using browser-side logic.
iCalendar RRULE Builder
Generate production-ready icalendar rrule output directly in the browser.
Timestamps, timezones, and cron schedules
Convert Unix/ISO times, compare timezones, explain cron expressions, and calculate date differences entirely client-side.
Epoch & ISO
Convert seconds/ms timestamps and ISO 8601 / RFC 3339 strings.
Timezones
Compare IANA zones and common UTC offsets for the same instant.
Cron tools
Generate, humanize, and list upcoming runs for 5- or 6-field cron.