You may use a slash, dash, period, or blank to separate the parts of the dates that you enter; I prefer a colon to distinguish the parts of times.  The year will default to the current year if you leave it out, seconds default to "00" if missing, and any null date or time will default to today and now.

Day Span
 
 
Starting Date in MM/DD/YYYY format.
Ending Date in MM/DD/YYYY format.
   
Days Total including the first and last.
Work Days are Monday through Friday.
Sabbaths occur on Saturday.
   
Time Span
 
 
in HH:MM:SS format.
in HH:MM:SS format.
   
Span  
   
Day Jump
 
 
Starting Date in MM/DD/YYYY format.
days
   
Ending Date  
   
Time Jump
 
 
in HH:MM:SS format.
in HH:MM:SS format.
   
Ending Time