The most important of Caesar’s reforms was to the calendar, which saw the abolition of the traditional republican lunisolar calendar and its replacement with a solar calendar now called the Julian calendar.
For all this I considered in my heart even to declare all this, that the righteous, and the wise, and their works, are in the hand of God: no man knoweth either love or hatred by all that is before them. Ecclesiastes 9:1 KJV