Date, Time & Calendar Math Overview

Perform intuitive calendar offsets, duration arithmetic, working day projections, and timezone conversions directly on your notepad.

For complete details on Unix timestamps, billable work hours, world clock timezones, city/airport conversions, and travel itinerary planning, see the Full Dates & Calendars Guide.

---

Quick Examples

today + 2 weeks                                 // Offset 14 calendar days
now + 45 mins                                   // Meeting duration offset
December 25 - today in days                     // Countdown duration
today + 15 business days                        // Skipping weekends
work hours between March 12 and March 25        // 72 hours (8h/day)
time in Tokyo                                   // Current Tokyo time
time difference between Zurich and Tokyo        // +7 hours
3:30pm NYC to London                            // 8:30 pm

👉 Continue to Full Date, Time & Calendar Math Guide