At work we always have to refer to military time/a 24 hour clock. I often see people having to count with their fingers to what the time is (e.g. counting that 8pm is 20:00). Similarly, with months I see people having to count with their fingers what number month it is when writing the date (e.g. counting to see that August is the 8th month).
Do you know the time in 24 hours and the number of the months off-by-heart or do you have to count it?