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A Handy Day and Date Calculator, for plus or minus day calculations

 


Full instructions for using this Calculator are further down this page.





















I want to calculate the number of days between two particular dates:


Today is 
 



1 Select your starting date:

    

     

     

    




2 Select your ending date:

    

     

    

    




3




Answer:

 
days

(excluding the starting date
but including the ending date).






 





I want to add/subtract a particular number of days to/from a particular date:


Today is 
    



1 Select your starting date:

    

     

     

    




2 Add or subtract?    
Add
Subtract


3 Number of days?     
 day(s)





4 



Answer:

Ending date:



(excluding the starting date
but including the ending date).








    









Instructions


To calculate the number of days between any two dates (ie. the left hand form above):





Step 1 - Choose your starting date.


Select the starting date of your choice using the drop-down arrows next to each selection box.  
When you open the Day Calculator, the date is automatically set to today's date.  As the calculator 
takes today's date from your system clock, it is important to make sure that your system date is 
correctly set for this function to work properly.



Step 2 - Choose your ending date.


Select the ending date of your choice using the drop-down arrows next to each selection box.  
When you open the Day Calculator, the date is automatically set to today's date.  As the calculator 
takes today's date from your system clock, it is important to make sure that your system date is 
correctly set for this function to work properly.



Step 3 - Calculate.


Press the button marked "Calculate" to carry out the calculation.  The number of days 
difference will be displayed at the bottom of the form.  Note that the calculation excludes 
the starting date itself (ie. day number 1 is the day after your starting date) but includes 

the ending date.






To add or subtract a chosen number of days to or from any date (ie. the right hand form above):




Step 1 - Choose your starting date.


Select the starting date of your choice using the drop-down arrows next to each selection box.  
When you open the Day Calculator, the date is automatically set to today's date.  As the calculator 
takes today's date from your system clock, it is important to make sure that your system date is 
correctly set for this function to work properly.



Step 2 - Choose whether to add or subtract.


Either select the radio button marked "Add" or the radio button marked "Subtract".



Step 3 - Type in the number of days to add or subtract.


This must be a whole number.



Step 4 - Calculate.


Press the button marked "Calculate" to carry out the calculation.  The new ending date 
will be displayed at the bottom of the form, including the day of the week.  Note that the 
calculation excludes the starting date itself (ie. day number 1 is the day after 
your starting date) but includes the ending date.







Year 2000 compliance:

The calculator is year 2000 compliant.  In other words, it works for dates before, after, in, and 
spanning, the year 2000.


Browser compatibility:

This calculator is designed for use with Microsoft Internet Explorer version 5.0 and above, or 
Netscape Navigator version 4.06 and above.  This page is best viewed at a resolution of 
800 x 600 or higher.