Standard time replaced thousands of local times, making railway schedules possible in the nineteenth century.

The longer version

Before standardisation every town kept its own solar time, so a city could be several minutes out of step with a neighbour. Railway companies faced dozens of competing local times, and printed timetables became impossible to read safely. Collisions and missed connections were a real consequence.

Companies and governments agreed to divide countries into broad bands sharing one clock, adopted at national and then international conferences. The change was resisted at first, since people disliked abandoning the time their own church tower had always kept, but the convenience of scheduled transport won quickly. Within a generation, local solar time had vanished from daily life.

Where this entry sits

These facts wander through clocks, calendars, time zones, and the long human effort to measure passing hours. You will find leap years, odd month lengths, ancient sundials, and the reasons modern timekeeping works the way it does. The full list sits on the Time and Calendars page, where every entry is listed in order.