18:11
Where did your 16 come from??
Broaden your mind.
In Engalnd we use a dot as the conventional decimal 'point' or poinr where the integer numbers end. On the Continent they conventionally (in some countries) use a comma.
Another fact is we tend to use the 'x' as the abscissa in England, and the 'y' for the ordinate. This is reversed in some countries on the continent.
The fundamental thing to do is to learn to understand what concept you are looking at or reading of, then the convention does not matter provided you can follow through the logic in terms of the convention the authore has used.
In maths we have a two fold use of the point.
It can be on the line or half way up and either way it indicates the integer stop point.
A dot can also indicate the arithmetical function ususally written as a 'x', multiplictaion.
The sexagesimal system of recording time, with 3'30''32
followed by a 'o' superscript, would read as 3hrs and 30 minutes 32 seconds AM. The same thing is indicated by 3:30:32, or by 03:30:32.
To translate it to decimal you divide the minutes by sixty, and the seconds by 3600 and add the results to the hours.
e.g. 3:30:32 = 3+(30/60)+(32/3600) = 3.509
In the 12 hour format the AM or PM should be used to indicate ante or post meridian. In the 24 hour format this is not necessary as the tme progress to the 13th hour etc. when the 1st hour post meridian is hit. In this case midnight is wrotten as 00:00:00.