Date & time tools
20 focused tools, ready to use in your browser.
Date Add and Subtract Calculator
Move a calendar date forward or backward by days, weeks, months, or years using UTC date arithmetic.
Date & timeBusiness Days Calculator
Count Monday–Friday dates between two dates, excluding an optional list of your own holidays.
Date & timeISO Week Calculator
Find ISO week number, week-based year, weekday, and Monday–Sunday dates for a calendar date.
Date & timeTime Zone Converter
Render an explicitly offset timestamp in several IANA time zones without guessing ambiguous local time.
Date & timeMeeting Time Zone Planner
Find 15-minute-grid meeting starts inside each participant’s local daily availability on a chosen UTC search day.
Date & timeTimesheet Elapsed Hours Calculator
Sum nonoverlapping work intervals with explicit timestamp offsets and unpaid break minutes.
Date & timeRecurring Calendar Date Generator
Generate bounded daily, weekly, monthly, or yearly dates while skipping nonexistent calendar dates.
Date & timeISO Fixed Duration Calculator
Add or subtract signed ISO day/time durations with exact millisecond arithmetic.
Date & timeRetail Fiscal Calendar Calculator
Map a date to a user-anchored retail fiscal week and period, and download the complete week calendar.
Date & timeJulian Date and MJD Converter
Convert a bounded UT1 Gregorian calendar clock to noon-based Julian Date or Modified Julian Date and back.
Date & timeVideo Timecode and Frame Count Calculator
Convert legal non-drop or NTSC drop-frame labels to exact frame counts with rational-rate elapsed time.
Date & timeInterval Schedule Coverage Analyzer
Merge explicit-offset schedule intervals or find intersection, coverage thresholds and finite-horizon gaps.
Date & timeOnline Countdown Timer
Run a local countdown with pause, resume and restart, then copy or download its current timing snapshot.
Date & timeOnline Stopwatch with Laps
Measure elapsed time in this tab, pause and resume, record up to 200 split laps, and export a JSON snapshot.
Date & timeAll-day Calendar Recurrence Evidence
Expand an explicitly supported all-day iCalendar recurrence subset and trace included or excluded dates inside a bounded start-date window.
Date & timeOffline Meeting Response Auditor
Review supplied candidate-time responses with explicit required attendees, quorum evidence, conditional votes and genuinely unanswered cells.
Date & timeDeclared Duty Rotation Calendar
Build an explicit dated circular-turn rota with selected weekdays, known absences, identical daily slots and complete shortage evidence.
Date & timeFocus and Break Session Timer
Run a declared local focus/break cycle with explicit phase starts, hidden-tab pauses and completed-phase evidence.
Date & timePrintable Calendar Workbench
Create actual Gregorian month grids with your own dated notes, explicit week start and a complete note appendix.
Date & timeDated Project Timeline Builder
Turn authored task dates, progress and point milestones into an original vector timeline with complete source rows.