Date, Time & Scheduling Tools
Fast, precise, and privacy-first utilities for calculating date differences, timezone conversions, workdays, countdowns, and schedule planning.
Next Solar & Lunar Eclipse Visibility Explorer
Interactive astronomical trajectory explorer for upcoming solar and lunar eclipses, totality paths, and visibility zones.
School Semester & College Graduation Date Estimator
Estimate degree completion dates, credit roadmaps, and semester pacing for college and school.
Bill Due Date & Recurring Cycle Schedule Calculator
Forecast future bill due dates, weekend business-day shifts, and annualized cash flow for subscriptions and recurring payments.
Habit Tracker Streak & Target Goal Probability Calculator
Forecast habit streak durability, calculate target milestone probabilities, and track 66-day automaticity metrics using UCL behavioral modeling.
Julian Day & Astronomical Modified Julian Date Converter
Convert between calendar dates, Julian Day (JD), Modified Julian Date (MJD), Reduced Julian Date (RJD), and Sidereal Time (GMST) with precision astronomical epoch calculations.
Solar Noon, Solar Zenith & Sun Path Angle Estimator
Calculate exact solar noon culmination time, solar zenith, altitude, azimuth angles, and daylight hours with NOAA precision.
Work Hours to Full-Time Equivalent (FTE) Calculator
Convert part-time hours, shifts, and team rosters into standardized Full-Time Equivalents (FTE), ACA employer mandates, and payroll metrics.
Employee Timesheet & Overtime Pay Calculator
Calculate daily and weekly work hours, lunch break deductions, overtime (1.5x), California daily double time (2.0x), and export payroll CSVs.
Meeting Overlap & Multi-Timezone Scheduler
Find perfect cross-timezone meeting overlaps, schedule remote team calls across international working hours, and export ICS calendar invites.
Pomodoro Interval Timer & Work Sprint Visualizer
Circadian focus sprint intervals, task batching, and flow state ergonomics.
Moon Phase Calendar & Visualizer
Calculate accurate lunar phases, illumination percentages, moon age, distance, and monthly lunar calendar views.
Sunrise & Sunset Time Estimator
Calculate accurate sunrise, sunset, twilight phases, golden hour, and daylight duration for any coordinates.
Event Countdown Timer Generator
Create customizable, embeddable countdown timers for launches, sales, and events.
Week Number Calculator (ISO-8601)
Calculate ISO-8601 week numbers, week date ranges, and annual week metrics.
Day of the Week Calculator
Determine the exact day of the week for any past, present, or future calendar date instantly.
Leap Year Checker
Instantly check leap years, century leap rules, and date range schedules.
World Clock & Timezone Converter Matrix
Convert live and scheduled time across multiple international time zones simultaneously.
Time Duration & Hour Counter
Calculate exact days between dates, net business working days, and perform date addition or subtraction in real-time.
Days Between Dates & Span Calculator
Calculate exact days between dates, working business days, total weeks, and perform date addition or subtraction.
100% Offline Date & Time Math
All calculations, timezone offsets, and duration counting happen completely locally within your browser tab. We never transmit your calendar entries, event details, or scheduling calculations to any server.
High Precision Chronological Engines
Our date engines strictly comply with ISO-8601 week specifications, standard Gregorian leap year rule sets, and global daylight saving transition database guidelines. Avoid manual calculation errors with custom roundings.
Event Countdowns & Scheduling Utilities
Easily plan projects or track personal milestones. Convert UTC times to local time zones in real-time, generate custom countdown widget timers, and compute net business workdays in seconds.
Zero Account Sign-ups Required
No subscription plans or account configurations are necessary. Load the date tools and start calculating immediately on any desktop or mobile device.
Frequently Asked Questions
- Are my schedules or event dates sent to a server?
- No. All date, timezone, and calendar math is calculated purely client-side on your own CPU in real-time.
- Does the workday calculator account for holidays?
- Yes. Our upcoming workday utilities support custom configurations so you can toggle local public holiday calendars and weekend schedules.
- Does the timezone converter adjust for daylight saving transitions?
- Yes. It leverages native browser Internationalization APIs (Intl) and timezone offset registries to correctly calculate DST changes.