The count of the months with God is twelve months in God's book the day He created the heavens and the earth; four of them are restricted. This is the correct system; so do not wrong yourselves in them. Fight those who set up partners collectively as they fight you collectively. Know that God is with the righteous.
Translation endnotes
[9:36] Verse 9:36 relates the number of months to the day of the creation of the earth. Perhaps in early days of the creation, the rotation of the Moon and Earth were synchronized and there were exactly 12 lunar months in a solar year. The increase in the length of the year or the decelerating earth is causing problems for modern technology which is very sensitive to small changes in the measurement of time, such as computers, electric grids, GPS systems, and missiles. In mid 20th century, scientists learned that the rotation of Earth was not sufficiently uniform as a standard of time. Besides solar gravity, there are many factors influencing the rotation of the earth. For instance, though in minor way, the Moon's gravity through tides causes deceleration, and melting of ice in the North Pole causes little acceleration. To compensate this net deceleration, almost every year we are adding one second to our atomic clocks, which defines and measures a second as 9,192,631,770 electromagnetic radiation or oscillation of Cesium 133. Since 1972 we added 23 leap seconds until 2006. However, the rate of the deceleration does not show a pattern. In recent years, the earth's rotation has been on schedule. See. 9:122