Learn about the timekeeping systems used by the NRC and the science behind time measurement
Get the time
Web clock
The official time in your time zone, according to the NRC's atomic clocks
Sunset and sunrise calculator
Sunrise and sunset times and hours of illumination for a given date for select Canadian cities
Radio time signal broadcast (CHU)
Information about the NRC's continuous shortwave radio broadcasts of the time, system status updates
Computer time and date
NRC time codes to keep your computer's time and date current
Network time protocol (NTP)
Information on using network time protocol to get the most accurate time information for your computer
Telephone talking clock
Access to the NRC's telephone talking clock
CBC radio daily time broadcast
Get Canada's official time via CBC radio
Science behind time measurement
NRC time services
Satisfy the requirements for time at all levels of precision
Time zones and daylight saving time
Information about Canada's 6 time zones
Leap seconds
Learn about the significance of the leap second in accurate time keeping
Leap years
Learn why leap years exist
Seasons
Learn when the seasons begin each year
Cesium atomic clocks
Learn why they exist and how they work
Global Positioning System (GPS) data
How the NRC uses GPS to intercompare frequency standards with those of other national laboratories