HP 17bII User's Manual | Page 151

HP Calculators User's Manual - 17bII.
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11: Time, Appointments, and Date Arithmetic  151 

File name : English-M02-1-040308(Print).doc   Print data : 2004/3/9

2. Key in the second date and press . 
3. Press ,  , or  to calculate the number of days 

using that calendar. 

 
Example: Calculating the Number of Days between Two Dates. Find 
the number of days between April 20, 2003 and August 2, 2040, using 
both the actual calendar and the 365-day calendar. Assume the date 
format is month/day/year. 
 
Keys: Display: 

Description: 

    

Displays CALC menu. 

4.202003  
  





 

Stores Apr. 20, 2003 
as first date and 
displays its day of the 
week. 

8.022040  
  



 

Stores Aug. 2, 2040 as 
second date. 

  



 



Calculates actual 
number of intervening 
days. 

  



  Calculates number of 

intervening days by a 
365-day calendar. 

 

Calculating Past or Future Dates 

To calculate a date a specified number of days from another date: 
 
1. Key in the known date (for today’s date, use  ) and press 

. 

2. Key in the number of days. This number should be negative if the 

unknown date precedes the known date. Press . 

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