Smart Calculators & Everyday Utility Tools
Welcome to ZENUtility, your central hub for all calculations related to time, dates, and timezones. Explore our powerful, free-to-use tools designed for precision and simplicity, whether you're coordinating across the globe or managing your daily schedule.
Time & Date
World Clock
View the current time in major cities across the globe on a customizable dashboard.
Open World Clock →Timezone Converter
Instantly convert time between different cities and timezones worldwide. Perfect for scheduling international meetings and calls.
Convert Timezones →Meeting Planner
Find the perfect meeting time across multiple international timezones with our visual grid.
Plan a Meeting →Sun Moon
Get accurate sunrise, sunset, and moon phase information for any location and date.
View Sun & Moon Data →Timers & Tools
Stopwatch
An easy-to-use online stopwatch with lap functionality for accurate timing.
Start Stopwatch →Countdown
Set a countdown to any future date and time. Keep track of upcoming events, holidays, or personal deadlines with a live timer.
Start a Countdown →Unix Timestamp Converter
Convert Epoch timestamps to human-readable dates and vice versa for development.
ConvertCalendars
Islamic Calendar
See the current Hijri calendar with corresponding Gregorian dates.
View Islamic Calendar →Chinese Calendar
See the current Lunisolar calendar with the year's zodiac animal.
View Chinese Calendar →Calculators
Date to Date Calculator
Find the duration between any two dates, calculated in years, months, and days.
Calculate Duration →Work Hours Calculator
A simple timesheet calculator to find your total work hours for the week.
Calculate Work Hours →Roman Numeral Converter
Convert any number to Roman numerals and back, instantly and accurately.
Convert Numerals →Time Calculator
Find out exactly how much time has passed since any moment in the past. Set a start date and time to launch a live, ticking counter that shows the duration down to the second.
Time Calculator→Age & Birthday Calculator
Calculate your exact age and find out the remaining days until your next birthday.
Calculate Age →Weekday Calculator
Find out the day of the week for any date. Simply select a date, and our tool will instantly tell you whether it was a Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday.
Weekday Calculator→Week Number Calculator
Find the official week number for any date according to the international ISO 8601 standard. This tool is perfect for project management, scheduling, and business planning.
Week Number Calculator→Islamic Tools
Islamic Calendar
See the current Hijri calendar with corresponding Gregorian dates.
View Islamic Calendar →Islamic Zakat Calculator
Calculate your obligatory Zakat based on current Gold/Silver rates and your total assets minus liabilities.
Islamic Zakat Calculator