Time, calendar & natural-light utilities
Time anywhere,
clear at a glance.
Convert time zones, compare cities, plan workdays and calculate sun or moon timing with focused tools that keep the answer ahead of the explanation.
DST-awareNamed regional zones by selected date
No accountCore calculations work without a profile
Transparent scopeEach tool states its assumptions and limitations
Start quickly
Most useful tools
Time Zone ConverterConvert a date and time between named regional time zones.Open tool →World ClockKeep current local times for several cities on one screen.Open tool →Meeting PlannerCompare one meeting instant across several locations.Open tool →Business Days CalculatorCount Monday-to-Friday weekdays between two dates.Open tool →Sunrise / Sunset CalculatorEstimate sunrise, solar noon and sunset for a location and date.Open tool →Moon Phase CalculatorEstimate lunar phase, age and illumination for a selected date.Open tool →
Browse by job
Three focused tool groups
10 tools
Time Zones & Clocks
Convert, compare and plan across world time zones with date-aware regional offsets.
Browse category →12 toolsCalendar & Workday
Work with business days, week numbers, calendars, time cards and holiday dates.
Browse category →8 toolsSun, Moon & Events
Calculate natural-light and lunar timing from a date, location and time zone.
Browse category →Time, calendar & astronomy