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egyptian
The Sumerians.
Properly speaking, there is no "English" calendar system. You probably mean the predominant Western Calendar (also called the Christian Calendar). This calendar system is best called the "Gregorian Calendar", after Pope Gregory XIII who introduced the calendar system in 1582.
Although there were some earlier forms of so-called proto-writing in China, it is generally assumed that the Sumerians created the earliest fully developed writing system called cuneiform around 4,000 BC.
Not country! Civilization is Aryan!
The calendar system developed by the Olmec civilization was adopted by most early Mexican cultures. This calendar, known as the Mesoamerican Long Count calendar, played a significant role in the civilizations that followed, such as the Maya and Aztec.
So they could be able t ok get a good job and education
The Aryans did not have a written language of their own. However, they likely adopted and modified the Indus Valley civilization's script, which later developed into Sanskrit writing.
The civilization that developed a system of writing using hieroglyphs is the Egyptian civilization. They were very advanced with their writing system.
Linear A
egyptian
the myan civilization
Egyptians
Maya
Egyptians
The Maya
Egyptians