Time & Random

A stopwatch and countdown timer with laps, custom durations, and audio reminders.

Run a local browser stopwatch with start, pause, resume, lap tracking, copy support, and CSV export for lap records.

Convert date-times between two time zones locally in your browser with DST-aware offsets and ISO / UTC / Unix details.

Calculate the difference between two date-time values locally in your browser, including signed duration, ISO duration, and total-unit outputs.

Add or subtract a duration from a base date-time locally in your browser with ISO Duration, local time, and Unix outputs.

Count business days between two dates locally in your browser and calculate business-day offsets with custom weekends and holiday exclusions.

Generate Cron expressions locally in your browser with field-based controls, presets, human-readable descriptions, and upcoming run previews.

Parse Cron expressions locally in your browser and inspect the natural-language explanation, field breakdown, and upcoming run times.

Generate standard .ics calendar events locally in your browser with time zones, all-day support, alarms, and recurrence rules.

Generate random numbers locally in your browser with custom ranges, counts, decimal places, rolling mode, no-repeat draws, and history.

Convert Unix timestamp to/from human readable date.

Translate Cron expressions into readable words and calculate execution times.