This year in the Jewish calendar, we are in the year 5766. Since when did we start to count in order to be now in the year 5766?
If I understand your question correctly, you are asking what event marks year 0 in the counting by which we arrive at, currently, year 5766. If so, the answer is that creation marks year 0 and the beginning of time. The year 5766 is arrived by calculating ages of people and generations mentioned in the Bible going back to creation. If I did not understand your question correctly, please let me know.
Be well,
Rabbi Yoel Spotts
