To find a relative date, 45 days in the past from 17-September, you can use manual calculation. First, subtract 45 days from 17-September. Since September has 30 days, subtracting 30 days will take you to 17-August. Subtracting another 15 days will lead you to 02-August. So, the relative date 45 days in the past from 17-September is 2-August.