To find a relative date, 120 days in the future from 15 October, you can use manual calculation. Start by adding 120 days to the current date. If we consider October as the 10th month, adding 120 days gives us 30 days for each month, which is equivalent to 4 months. Therefore, adding 4 months to October lands us in February. Since February has only 28 days, the remaining 2 days must be added to the 15th of February.

For a more detailed breakdown of the calculation, here’s how it works: starting from 15 October, adding 120 days would take us beyond the 31 days in October and 30 days each in November and December. This totals 91 days. Therefore, the remaining 29 days fall into January and February. Since January has 31 days, subtracting 31 from 29 leaves us with -2 days. These extra days are carried over to February, putting us on the 17th of February.

So, to find a relative date 120 days in the future from 15 October, manually calculate by accounting for each month’s days and carrying over any excess days to the following months. With this method, you can precisely determine the date 120 days ahead and understand the process behind the calculation.