World Clock & Countdown
Check the time across cities worldwide, convert between time zones, and share countdowns to the events that matter.
World Clock
Check current time in cities around the world
Time Converter
Easily convert time between two cities
Countdown
Time remaining until holidays and events worldwide
Timer
Free online timer with alarm sound. Set any duration and start with one click.
Clock
A beautiful fullscreen clock for classrooms, cafes, gyms, and streamers
Today
Today's holidays and historical events
Awake
Real-time estimate of how many people are awake on Earth
Population
Real-time world population estimate based on UN data. View births, deaths, and regional statistics.
Date Calc
Calculate your exact age from your date of birth
Year Progress
Visualize how much of the year has passed in real time
Articles
In-depth articles about time and timezones
Glossary
Key terms about time and timezones explained
Popular Articles
How TOTP Works - The 6-Digit Code Generated From Time Sync
The 6-digit codes shown by Google Authenticator and similar apps are generated from a shared secret and the current time. This article explains the TOTP algorithm defined in RFC 6238, the difference from HOTP, common time-drift failure modes, and what is actually inside the QR code you scan during setup.
BasicsSolar vs Lunar Calendars - The Astronomy Behind World Calendar Systems
The Gregorian calendar, the Islamic calendar, and the Hebrew calendar use fundamentally different astronomical bases. This article explains the difference between solar, lunar, and lunisolar calendars, why each civilization chose its system, and how modern holidays still mix the influences of all three.
BasicsThe History of the Hourglass - Why It Survives in the Digital Age
The hourglass shaped medieval navigation, retreated as mechanical clocks took over, and yet still appears in modern boardgames, ceremonies, and software loading icons. This article traces the physics, the maritime history, and the symbolic afterlife of one of humanity's oldest timing devices.
TechnologyHow Stopwatches Work - From Mechanical Movements to GPS Timing
A stopwatch measures elapsed time, not absolute time, and that distinction shapes its design. From mechanical pocket watches to quartz, electronic photo-finish, and GPS-synchronized track-side systems, stopwatch technology has evolved to meet ever-tighter precision demands.
LifestyleExcel Date and Time Functions - DATE, NETWORKDAYS, and Practical Patterns
Excel's date and time functions are everyday tools for finance, scheduling, and business analytics. This article covers the serial number model, the most useful functions including DATE, TODAY, NETWORKDAYS, EOMONTH, and WEEKNUM, with practical examples from real spreadsheets.
TechnologyMySQL Timezone Configuration - Server, Connection, and Column Behavior
MySQL timezone bugs almost always trace back to a misunderstanding of three layers: server defaults, session settings, and column types. This article explains why TIMESTAMP and DATETIME behave differently, how the time_zone variable interacts with connections, and how to configure JDBC drivers correctly.