What I mean to ask is that how did people coordinate day to day activities without a universal date and time system? And how did the current date and time system get implemented universally?
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Clocks are one of the oldest of human inventions–pretty much dating back to the start of civilization itself. Prior to then, people undoubtedly lived in small communities and could coordinate informally: imagine, if you will, living amongst about 100 family members and relatives in a compound with no-one else around. You probably could coordinate things with a rough “let’s go now” or “tomorrow morning we’ll go.”
As villages grew, central time keeping systems were invented to display the time–for example, large clocks on clock towers, or churches ringing church bells, to keep events coordinated within a village. Different villages didn’t synchronize times between each other–but then, if the major way to go between villages is by a multi-day journey on foot, it kinda didn’t matter.
But as someone else pointed out, it was the creation of trains and train timetables that created the need for synchronized clocks and timezones.
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