Date & Time
Time is a reliable source of bugs: a Unix timestamp that turns out to be milliseconds instead of seconds, a cron expression that fires at the wrong hour, a date that shifts because nobody agreed on a timezone. These tools convert between epoch timestamps and human dates with the seconds-versus-milliseconds ambiguity handled for you, build and preview cron schedules so you can see the next run times before deploying, and keep the awkward realities — UTC as the true reference, the 2038 problem, daylight-saving transitions — front and centre. Everything is computed locally, so you can check a production timestamp without sending it anywhere.
Unix Timestamp ConverterConvert a Unix epoch timestamp to a human date (and back) with ISO 8601, UTC, and local time. Auto-detects seconds vs milliseconds, fully in-browser.Cron Expression GeneratorBuild a cron expression from presets or your own edits and preview the next five run times in your local timezone. Runs entirely in your browser.Age CalculatorCalculate exact age in years, months, and days from a birth date to today, plus total days, weeks, and days until the next birthday. Private and in-browser.Timezone ConverterConvert a date and time between any two IANA time zones with correct daylight-saving handling. Reads the wall clock in the source zone. Runs in your browser.Cron to TextPaste a five-field cron expression and read a plain-English description of when it runs. Supports ranges, lists, steps, and named months and weekdays.Date Difference CalculatorFind the exact time between two dates: total days, weeks, and hours, a years, months, and days breakdown, and the count of business days that fall between them.Duration Formatter & ParserConvert seconds into a readable duration like 1h 2m 3s and the ISO 8601 form PT1H2M3S, or parse a duration string back into a total number of seconds.