Schedule tools
ClientIndex of time-focused utilities: convert Unix time, parse cron schedules, and compare time zones—each card opens its own route.
How this hub is organized
Epoch conversion, ISO-8601 duration parse/build, cron next-run previews, and IANA timezone comparison are separate tools—pick the card that matches instants vs spans vs repeating jobs.
Browse schedule utilities
Cards follow the home catalog order for this category.
Unix timestamp converter
ClientEpoch to date: seconds, milliseconds, ISO-8601, UTC and local time—in browser.
ISO-8601 duration
ClientParse P…/PT… into labeled parts and plain English, or build normalized duration strings—local only.
Cron expression helper
ClientHuman-readable schedule, next run times—standard 5-field cron in your browser.
Cron expression builder
ClientCompose five-field cron strings with presets—copy for crontab or job schedulers; local only.
Stopwatch & lap timer
ClientStart, stop, reset, and record lap times with centisecond display—runs locally in your browser.
Countdown timer
ClientSet a target local date and time—see days, hours, and seconds remaining; updates in your browser.
World clock & time zones
ClientCompare IANA time zones side by side with the same instant—no server round-trip.
ISO week number
ClientISO 8601 week number and Monday–Sunday bounds for any calendar date—local browser calculation.
Business days calculator
ClientCount weekdays (Mon–Fri) between two calendar dates—inclusive, computed in your browser.
Add days to a date
ClientShift a calendar date forward by N days—local Date math.
Subtract days from a date
ClientMove backward N calendar days from a start date.
Day of year (1–366)
ClientOrdinal day number within the calendar year.
Age in days
ClientDays between birth date and today (UTC calendar).
Weekday name from date
ClientReturn English weekday for an ISO date.
Days until a date
ClientCount whole days from today (UTC) to a target date.
ISO weekday number
ClientMonday=1 … Sunday=7 per ISO-8601.
Count weekends in range
ClientCount Saturday/Sunday days between two ISO dates inclusive.
Calendar quarter
ClientReturn Q1–Q4 for an ISO date.
Week of year (ISO)
ClientISO-8601 week number for a date—week-year aware.
Cron expression validator
ClientCheck five-field cron syntax—field counts and allowed ranges.
Nearby workflows on Toolcore
- Unix timestamp — when logs mix seconds, milliseconds, and ISO strings.
- ISO-8601 duration — for PnY…M…DT…H spans next to absolute times.
- Cron expression — to see upcoming fires after the instant is clear.
- Timezone converter — when operators think in local offsets instead of UTC.
Common use cases
- Start from the timestamp tool when logs mix seconds, milliseconds, and ISO strings and you need a single normalized view.
- Use the ISO-8601 duration page when APIs return PnYnM or PT strings and you need a labeled breakdown or a canonical spelling.
- Use the cron page when documenting or debugging a five-field schedule and you want human-readable next fire times.
- Open the time zone tool when planning a meeting across regions and you need the same instant in multiple IANA zones.
Common mistakes to avoid
Mixing up seconds and milliseconds
Always check the unit your source system uses—many APIs use seconds, JavaScript Date often uses milliseconds.
FAQ
Are timestamps sent to a server?
No. These utilities run locally in your tab unless a page states otherwise.