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Calculate the number of seconds elapsed since the start of the hour
Source position: dateutil.inc line 234
function SecondOfTheHour( 
const AValue: TDateTime 
):Word; 
AValue 

Moment in the hour 
Number of seconds elapsed since the start of the hour
SecondOfTheHour returns the number of seconds that have passed since the start of the Hour (HH:00:00) till the moment indicated by AValue. This is a zerobased number, i.e. HH:00:00.999 return 0.
For an example, see the MinuteOfTheHour function.

Calculate the number of seconds elapsed since the start of the year. 


Calculate number of seconds elapsed since the start of the month. 


Calculate the number of seconds elapsed since the start of the week 


Calculate the number of seconds elapsed since the start of the day 


Calculate the number of seconds elapsed since the start of the minute 


Calculate the number of minutes elapsed since the start of the hour 


Calculate the number of milliseconds elapsed since the start of the hour 