I'm not sure what I'm missing here. But I cannot find a way to round down. In my situation I'm calculating the amount of Years between two dates represented by a Decimal with only 1 decimal place. I'm calculating this based on the days between the two dates.

If I have two dates that are not quite a year off say 0.9888888888888889 days, then .round(1) will give me 1.0 and returning 1.0 when it's less then a year would not be accurate. I need it to round down to 0.9 but I can't seem to find a way to do that. 

I feel like I'm missing something fundamentally since I can't find anyone having a similar issue, so feel free to point out if I'm going about this wrong as well.