Timestamps, timezones, cron, durations.
Unix ↔ ISO 8601 ↔ human-readable dates.
Convert times across time zones.
Explain and preview cron expressions.
Build cron expressions with a visual UI.
Add, subtract and diff time durations.
Format dates with strftime, moment or Intl tokens.
Calculate exact age in years, days, and seconds.
Get ISO week numbers for any date.
Live ticking Unix timestamp in seconds, milliseconds, microseconds.
Convert any date to all common ISO 8601 representations.
Convert dates to RFC 3339 (the subset of ISO 8601 used by HTTP APIs).
Convert JavaScript / Java millisecond epoch to readable dates.
Unix, GPS, TAI, Julian Day, Modified Julian Day side by side.
Search for an IANA timezone by city or country.
Live clock for selected timezones around the world.
Find overlapping work hours across timezones.
Every current UTC offset with example zones and DST status.
List the next N fire times for a cron expression.
Convert N/min → N/hour / N/day and check budget feasibility.
Count weekdays between two dates, with optional holiday list.
Add or subtract N days / months / years from a date.
Days / weeks / months / years between two dates.
Countdown to a specific future date.
Find Q1/Q2/Q3/Q4 for any date — calendar or fiscal.
Ordinal day (1–366) of any date.
Print-ready monthly and yearly calendar.
Visual builder for strftime / format-date tokens with live preview.
“5 minutes ago” / “in 3 days” formatting between two dates.
Sunrise, sunset, golden hour and blue hour for any place + date.
Current moon phase and monthly phase calendar.
When DST starts / ends in a given timezone this year and next.
Is year X a leap year? List of nearby leap years.
View a year as ISO weeks 1–53.
Fiscal year and quarter for any date with a configurable start month.
Add / subtract durations like 2h30m + 1h15m.
Browser-based stopwatch and countdown timer with laps.
25 / 5 Pomodoro timer with browser notifications.
All strftime / Intl / Moment / Luxon tokens in one table.
ISO 8601 syntax reference with concrete examples.
Quick answers to the questions developers ask most.
Switch context — 11 more toolsets ready to go.