Schedule tools
ClientUse this index for time-focused utilities: convert Unix timestamps, parse durations, preview cron schedules, compare time zones, or run lightweight date and timer helpers. Each card opens its own route.
For a task-first guide to logs, deadlines, cron, and time zones, read Schedule tools for logs and deadlines.
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. Start with timestamp for logs, cron for scheduled jobs, time zone for meetings, and date or timer tools for planning.
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.
Pomodoro timer
ClientClassic Pomodoro work and break timer in the browser—no install, 25/5 intervals on this tab.
Cron expression validator
ClientCheck five-field cron syntax—field counts and allowed ranges.
Business days between dates
ClientCount Mon–Fri days between two ISO dates inclusive.
Add business days
ClientShift a start date forward by N weekdays.
Days in month
ClientReturn day count for YYYY-MM.
Add weeks to date
ClientShift ISO date forward by whole weeks.
Subtract weeks from date
ClientMove ISO date backward by whole weeks.
Add months to date
ClientShift calendar month forward preserving day when possible.
Subtract months from date
ClientShift calendar month backward preserving day when possible.
Cron next run (simple)
ClientNext UTC run time for 5-field cron (minute hour dom month dow).
ISO duration to human
ClientParse ISO-8601 duration (PnYnMnDTnHnMnS) to readable text.
Age from birth date
ClientYears, months, and days since an ISO birth date (UTC).
Weekdays between dates
ClientCount Mon–Fri days between two ISO dates inclusive—local schedule math.
Next business day
ClientFind the next weekday after an ISO start date—skips Sat/Sun.
Julian day number
ClientConvert ISO calendar date to Julian day number (JD at noon UTC).
Excel serial date
ClientConvert ISO date to Excel 1900-date-system serial number.
ISO week date
ClientShow ISO-8601 year-week-day for a calendar date.
Days until date
ClientCalendar days from today to a target ISO date.
Weeks until date
ClientWhole weeks from today to a target ISO date.
Months until date
ClientApproximate whole months from today to target date.
Add days to date
ClientAdd N calendar days to an ISO start date.
Subtract days from date
ClientSubtract N calendar days from an ISO date.
Days until weekday
ClientDays from a start date until the next given weekday (0=Sun).
Weeks between dates
ClientWhole weeks between two ISO dates (UTC).
Months between dates
ClientCalendar months between two ISO dates.
Calendar quarter
ClientQ1–Q4 and year from an ISO date.
Fiscal year quarter
ClientFiscal quarter assuming FY starts in July (US federal style).
Week of year (ISO)
ClientISO week number for YYYY-MM-DD date.
Day of year
ClientOrdinal day (1–366) for a calendar date.
Business day count
ClientWeekdays between two dates (Mon–Fri).
Days until date
ClientCalendar days from today to target date.
Fiscal quarter start
ClientStart date of fiscal quarter from FY start month.
Excel serial to ISO date
ClientConvert Excel day serial to YYYY-MM-DD.
ISO date to Excel serial
ClientConvert YYYY-MM-DD to Excel day serial.
Julian day to date
ClientConvert Julian day number to Gregorian date.
Business days between (lite)
ClientWeekday count between two YYYY-MM-DD dates.
Moon phase (simple)
ClientApproximate lunar phase name for a date.
Unix ms to ISO
ClientConvert millisecond epoch to ISO UTC.
ISO to Unix ms
ClientConvert ISO datetime to epoch milliseconds.
Quarter end date
ClientLast day of fiscal quarter for YYYY-Q.
US semester start
ClientTypical US academic semester start dates.
Nth weekday of month
ClientFind date of nth weekday in YYYY-MM.
Julian day number
ClientJulian day from Gregorian YYYY-MM-DD.
ISO week-year
ClientISO week number and week-year from date.
Days between dates
ClientCalendar day count between two dates.
Weeks between dates
ClientWhole weeks between two dates.
Months between dates
ClientCalendar months between two dates.
Add days to date (lite)
ClientAdd N calendar days to an ISO start date.
Subtract days from date (lite)
ClientSubtract N calendar days from an ISO date.
Next weekday date (lite)
ClientDate of next occurrence of weekday (0=Sun).
Previous weekday date (lite)
ClientDate of previous occurrence of weekday (0=Sun).
Day of year (lite)
ClientOrdinal day (1–366) for a calendar date.
Easter date calculator
ClientWestern Easter Sunday for a given year.
Business days count
ClientWeekday count between two ISO dates inclusive.
Month start date
ClientFirst day of month for YYYY-MM-DD.
Month end date
ClientLast day of month for YYYY-MM-DD.
ISO week number (lite)
ClientISO-8601 week number for a date.
Fiscal quarter calculator
ClientCalendar quarter from YYYY-MM-DD.
Leap year check (lite)
ClientTest whether a year is a leap year.
Days in month (lite)
ClientDays in month for YYYY-MM.
Weekday name calculator
ClientWeekday name for YYYY-MM-DD.
Day of week number
ClientISO weekday number 1=Mon..7=Sun.
ISO week Monday date
ClientMonday date for ISO year-week.
Nth weekday in month
ClientDate of nth weekday in YYYY-MM.
Age in days calculator
ClientWhole days between two ISO dates.
Countdown days to date
ClientDays from today UTC to target date.
Days until date calc
ClientSigned day difference from start to end date.
Ordinal date calculator
ClientDay-of-year number for YYYY-MM-DD.
Month end date
ClientLast calendar day of YYYY-MM.
Week of month
ClientWhich week (1–5) a date falls in.
Leap year check
ClientIs a year a Gregorian leap year?
Days in month
ClientCount days for YYYY-MM.
Add months to date
ClientShift YYYY-MM-DD by N months.
Subtract months from date
ClientShift YYYY-MM-DD backward by N months.
Workdays in range
ClientMon–Fri count between two dates.
Moon phase (lite)
ClientApproximate lunar phase for a date.
US fiscal year end
ClientFederal fiscal year end date for a year.
Date difference in days
ClientCalendar days between two ISO dates.
Add weeks to date
ClientShift ISO date forward by N weeks.
Subtract days from date
ClientGo back N days from an ISO date.
Quarter from date
ClientCalendar quarter Q1–Q4 for YYYY-MM-DD.
ISO week number
ClientISO-8601 week number for a date.
Age from birthdate
ClientYears old on a reference date.
Time until date
ClientDays from today until a target date.
Date to Unix epoch
ClientSeconds since 1970-01-01 UTC for ISO date.
Unix epoch to date
ClientUTC date from seconds since epoch.
Weekday name
ClientDay of week for YYYY-MM-DD.
Add months to date
ClientCalendar date plus N months.
Subtract weeks from date
ClientCalendar date minus N weeks.
Weekday count
ClientCount Mon–Fri days between two dates.
Fiscal year start
ClientFiscal year label for a date (Oct start).
Leap year check
ClientTest whether a year is a leap year.
Day of year
ClientOrdinal day number (1–366) for a date.
Month end date
ClientLast calendar day of the month for a date.
Add hours to datetime
ClientISO datetime plus N hours.
Weekend check
ClientTest whether a date falls on a weekend.
Quarter end date
ClientLast day of calendar quarter for a date.
Add years to date
ClientCalendar date plus N years.
Date diff in weeks
ClientWhole weeks between two dates.
ISO week number
ClientISO-8601 week number for a date.
Timezone offset hint
ClientUTC offset for IANA zone at a date.
Epoch to ISO date
ClientConvert Unix seconds to ISO-8601 date.
ISO to epoch
ClientConvert ISO-8601 datetime to Unix seconds.
Add business days
ClientCalendar date plus N weekdays.
Age in days
ClientDays between birth date and today.
Countdown days
ClientDays until a target date.
Julian date
ClientJulian day number for a calendar date.
Add months to date
ClientCalendar date plus N months.
Subtract days from date
ClientCalendar date minus N days.
Day of year
ClientOrdinal day number for a calendar date.
Leap year check
ClientTest whether a year is a leap year.
Month end date
ClientLast calendar day of month for a date.
Quarter end date
ClientLast day of calendar quarter for a date.
Weekday count
ClientCount Mon–Fri days between two dates.
Fiscal year start
ClientFY start date for Jul–Jun fiscal calendar.
Date to epoch
ClientUnix seconds for YYYY-MM-DD at UTC noon.
Epoch to date
ClientYYYY-MM-DD from Unix seconds.
Add weeks to date
ClientCalendar date plus N weeks.
Add years to date
ClientCalendar date plus N years.
Weeks between dates
ClientWhole weeks between two calendar dates.
ISO week number
ClientISO-8601 week number for a date.
Quarter start date
ClientFirst day of calendar quarter for a date.
ISO week start
ClientMonday of ISO week containing date.
Days until date
ClientDays from today until a target date.
Age in years
ClientWhole years between birth date and today.
Weekday name
ClientDay of week name for a calendar date.
Business days estimate
ClientEstimate weekdays between two dates (no holidays).
Add months to date
ClientCalendar date plus N months.
Subtract days from date
ClientCalendar date minus N days.
Month end date
ClientLast day of month containing date.
Month start date
ClientFirst day of month containing date.
Leap year check
ClientCheck if a year is a leap year.
Day of year
ClientOrdinal day number 1–366 for a date.
Fiscal quarter
ClientUS federal fiscal quarter (Oct start) for date.
Hours until midnight
ClientHours remaining until end of local day.
Weekend day count
ClientCount Sat/Sun between two dates.
Date to ISO week
ClientISO date with week number for a calendar date.
Add weeks to date
ClientCalendar date plus N weeks.
Add years to date
ClientCalendar date plus N years.
Days between dates
ClientWhole days between two calendar dates.
Weekday name
ClientEnglish weekday name for a calendar date.
ISO week number
ClientISO-8601 week number for a calendar date.
Calendar quarter
ClientQ1–Q4 for a date (January start).
Days in month
ClientHow many days the month of a date has.
Next Monday
ClientThe following Monday after a date.
Age in whole years
ClientWhole years from a birth date to today.
Unix from date
ClientUTC Unix seconds at noon for a calendar date.
Add days to date
ClientCalendar date plus N days.
Subtract months from date
ClientCalendar date minus N months.
Weeks between dates
ClientWhole weeks between two calendar dates.
English month name
ClientFull English month name for a calendar date.
ISO week and year
ClientISO-8601 week number and ISO week-year label.
US federal FY start
ClientUS federal fiscal year start date for a calendar date.
Days in year
Client365 or 366 for the year in a date.
Next Friday
ClientThe following Friday after a date.
Age in days
ClientWhole days since a birth or start date.
Unix to date
ClientUnix seconds to YYYY-MM-DD UTC.
Add weeks to date
ClientCalendar date plus N weeks.
Subtract days from date
ClientCalendar date minus N days.
Months between dates
ClientWhole calendar months between two dates.
Calendar quarter
ClientQ1–Q4 label for a calendar date.
Day of year
ClientOrdinal day number (1–366) for a date.
Leap year check
ClientWhether the year in a date is a leap year.
Next Monday
ClientThe following Monday after a date.
Age in years
ClientWhole years since a birth or start date.
Date to Unix
ClientYYYY-MM-DD to Unix seconds at UTC noon.
Weekday name
ClientEnglish weekday name for a calendar date.
Add months to date
ClientCalendar date plus N months.
Subtract weeks from date
ClientCalendar date minus N weeks.
Weeks between dates
ClientWhole calendar weeks between two dates.
US fiscal quarter
ClientUS federal fiscal quarter (Oct start) for a date.
Week of year
ClientISO-style week number (1–53) for a date.
Weekend check
ClientWhether a date falls on Saturday or Sunday.
Next Friday
ClientThe following Friday after a date.
Age in days
ClientWhole days since a start date.
Unix to date
ClientUnix seconds to YYYY-MM-DD UTC.
Month name
ClientEnglish month name for a calendar date.
Add weeks to date
ClientCalendar date plus N weeks.
Subtract days from date
ClientCalendar date minus N days.
Months between dates
ClientWhole calendar months between two dates.
Calendar quarter
ClientCalendar quarter (Jan start) for a date.
Day of year
ClientOrdinal day number (1–366) for a date.
Weekday name
ClientEnglish weekday name for a calendar date.
Next Monday
ClientThe following Monday after a date.
Age in years
ClientWhole years since a birth or start date.
Date to Unix
ClientYYYY-MM-DD to Unix seconds UTC midnight.
Quarter name
ClientCalendar quarter label for a date.
Add months to date
ClientCalendar date plus N months.
Subtract weeks from date
ClientCalendar date minus N weeks.
Weeks between dates
ClientWhole weeks between two calendar dates.
Fiscal quarter
ClientUS federal fiscal quarter (Oct start) for a date.
Week of year
ClientISO-style week number for a date.
Month name
ClientEnglish month name for a calendar date.
Next Friday
ClientThe following Friday after a date.
Age in days
ClientWhole days since a start date.
Unix to date
ClientUnix seconds to YYYY-MM-DD UTC.
Is weekend?
ClientWhether a date falls on Saturday or Sunday.
Add months to date
ClientCalendar date plus N months.
Subtract weeks from date
ClientCalendar date minus N weeks.
Weeks between dates
ClientWhole weeks between two calendar dates.
Fiscal quarter
ClientUS federal fiscal quarter (Oct start) for a date.
Week of year
ClientISO-style week number for a date.
Month name
ClientEnglish month name for a calendar date.
Next Friday
ClientThe following Friday after a date.
Age in days
ClientWhole days since a start date.
Unix to date
ClientUnix seconds to YYYY-MM-DD UTC.
Is weekend?
ClientWhether a date falls on Saturday or Sunday.
Add years to date
ClientCalendar date plus N years.
Subtract months from date
ClientCalendar date minus N months.
Days between dates
ClientWhole days between two calendar dates.
Calendar quarter
ClientCalendar quarter (Jan start) for a date.
Day of year
ClientOrdinal day number in the calendar year.
Weekday name
ClientEnglish weekday name for a calendar date.
Next Monday
ClientThe following Monday after a date.
Age in years
ClientWhole years since a birth or start date.
Date to Unix
ClientCalendar date to Unix seconds at UTC noon.
Is leap year?
ClientWhether a calendar year has 366 days.
Add months to date
ClientCalendar date plus N months.
Subtract years from date
ClientCalendar date minus N years.
Weeks between dates
ClientWhole weeks between two calendar dates.
Fiscal quarter (Oct start)
ClientUS federal fiscal quarter (Oct 1 start) for a date.
ISO week number
ClientISO-8601 week number for a calendar date.
Month name
ClientEnglish month name for a calendar date.
Next Friday
ClientThe following Friday after a date.
Age in months
ClientWhole months since a birth or start date.
Unix to date
ClientUnix seconds to calendar date at UTC.
Days in month
ClientNumber of days in the month of a given date.
Add days to date
ClientCalendar date plus N days.
Subtract weeks from date
ClientCalendar date minus N weeks.
Months between dates
ClientWhole months between two calendar dates.
Calendar quarter (Jan start)
ClientStandard calendar quarter (Jan 1 start) for a date.
Week of year
ClientSimple week-of-year number for a calendar date.
Day of year
ClientOrdinal day number (1–366) for a calendar date.
Next Sunday
ClientThe following Sunday after a date.
Age in years
ClientWhole years since a birth or start date.
Unix ms to date
ClientUnix milliseconds to calendar date at UTC.
Weekend count
ClientCount Saturday and Sunday days between two dates.
Add weeks to date
ClientCalendar date plus N weeks.
Subtract days from date
ClientCalendar date minus N days.
Weeks between dates
ClientWhole weeks between two calendar dates.
Fiscal quarter (Jul start)
ClientAustralian-style fiscal quarter (Jul 1 start) for a date.
ISO week number
ClientISO 8601 week number for a calendar date.
Weekday name
ClientDay of week name for a calendar date.
Next Monday
ClientThe following Monday after a date.
Age in days
ClientWhole days since a birth or start date.
Unix seconds to date
ClientUnix seconds to calendar date at UTC.
Weekday count
ClientCount Monday–Friday days between two dates.
Add months to date
ClientCalendar date plus N months.
Subtract weeks from date
ClientCalendar date minus N weeks.
Days between dates
ClientWhole days between two calendar dates.
Fiscal quarter (Oct start)
ClientUS federal-style fiscal quarter (Oct 1 start) for a date.
ISO week-year
ClientISO 8601 week-year for a calendar date.
Month name
ClientFull month name for a calendar date.
Next Friday
ClientThe following Friday after a date.
Age in weeks
ClientWhole weeks since a birth or start date.
Unix ms to date
ClientUnix milliseconds to calendar date at UTC.
Weekend count
ClientCount Saturday–Sunday days between two dates.
Add weeks to date
ClientCalendar date plus N weeks.
Subtract months from date
ClientCalendar date minus N months.
Weeks between dates
ClientWhole weeks between two calendar dates.
Fiscal quarter (Jan start)
ClientCalendar fiscal quarter (Jan 1 start) for a date.
ISO week number
ClientISO 8601 week number for a calendar date.
Weekday name
ClientFull weekday name for a calendar date.
Next Monday
ClientThe following Monday after a date.
Age in days
ClientWhole days since a birth or start date.
Unix seconds to date
ClientUnix seconds to calendar date at UTC.
Weekday count
ClientCount Monday–Friday days between two dates.
Add days to date
ClientCalendar date plus N days.
Subtract years from date
ClientCalendar date minus N years.
Months between dates
ClientWhole calendar months between two dates.
Fiscal quarter (Apr start)
ClientCalendar fiscal quarter (Apr 1 start) for a date.
Day of year
ClientOrdinal day number (1–366) for a calendar date.
Leap year check
ClientWhether a calendar year is a leap year.
Next Friday
ClientThe following Friday after a date.
Age in years
ClientWhole years since a birth or start date.
Date to Unix seconds
ClientCalendar date to Unix seconds at UTC noon.
Weekend count
ClientCount Saturday–Sunday days between two dates.
Add hours to datetime
ClientISO datetime plus N hours.
Subtract days from date
ClientCalendar date minus N days.
Years between dates
ClientWhole calendar years between two dates.
Fiscal quarter (Jul start)
ClientCalendar fiscal quarter (Jul 1 start) for a date.
Calendar quarter
ClientStandard calendar quarter (Q1–Q4) for a date.
Day of week number
ClientISO weekday number (Mon=1 … Sun=7) for a date.
Next Sunday
ClientThe following Sunday after a date.
Age in months
ClientWhole months since a birth or start date.
Date to Unix milliseconds
ClientCalendar date to Unix milliseconds at UTC noon.
Business day count
ClientCount Monday–Friday days between two dates.
Add minutes to datetime
ClientISO datetime plus N minutes.
Add weeks to date
ClientCalendar date plus N weeks.
Months between dates
ClientWhole calendar months between two dates.
Fiscal quarter (Oct start)
ClientCalendar fiscal quarter (Oct 1 start) for a date.
ISO week number
ClientISO-8601 week number for a date.
Day of year
ClientOrdinal day number (1–366) for a date.
Next Monday
ClientThe following Monday after a date.
Age in days
ClientWhole days since a birth or start date.
Unix to date
ClientUnix seconds to calendar date at UTC.
Weekend day count
ClientCount Saturday–Sunday days between two dates.
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.