Calcular.tools
Hours Calculator
Use these tools to find the number of hours and minutes between two times or dates.
The Story of Time
From Sundials to Atomic Clocks
The concept of dividing the day into smaller parts is ancient. The Egyptians are credited with dividing daytime and nighttime into 12 parts each, leading to our 24-hour day. Initially, the length of an 'hour' varied with the seasons—daylight hours were longer in the summer and shorter in the winter. It wasn't until the advent of mechanical clocks in the 14th century that the hour became a fixed unit of 60 minutes, paving the way for the precise timekeeping we rely on today and the need for a modern hour calculator.