Let’s face it: life is just one day after another. “The sun ariseth, and the sun goeth down, and hasteth to his place where he arose,” says Ecclesiastes, adding that this was all very wearisome. Given the tedious repetition of days, it is a bit odd to count them. Neither hunters nor the first farmers needed a calendar. The changing seasons gave sufficient warning of what was going on. Once your crop was ready, you could harvest it. In most agricultural societies, there was no need to measure time very accurately. There certainly was no need to construct a complex calendar.
The first calendars were impractical. Here is W.F. Albright’s translation of a calendar found in Gezer in Israel (now in the Archaeological Museum in Istanbul). It dates to about 900 BC.
His two months are harvest
His two month are planting
His two months are late planting
His month is hoeing up of flax
His month is harvest of barley
His month is harvest and feasting
His two months are vine-tending
His month is summer fruit.