View source for Template:DateDiff

<includeonly>{{formatnum:{{#expr:
        + {{#expr: 
        

        + (({{{year2|{{{4|{{CURRENTYEAR}}}}}}}} - 1) * 365)
        + ((({{{year2|{{{4|{{CURRENTYEAR}}}}}}}} - 1) - (({{{year2|{{{4|{{CURRENTYEAR}}}}}}}} - 1) mod 4)) / 4)     
        - ((({{{year2|{{{4|{{CURRENTYEAR}}}}}}}} - 1) - (({{{year2|{{{4|{{CURRENTYEAR}}}}}}}} - 1) mod 100)) / 100) 
        + ((({{{year2|{{{4|{{CURRENTYEAR}}}}}}}} - 1) - (({{{year2|{{{4|{{CURRENTYEAR}}}}}}}} - 1) mod 400)) / 400) 

       
 
        + {{ #ifexpr:     
                     ({{{month2|{{{5|{{CURRENTMONTH}}}}}}}} - 1) < 8 
                     | ( ({{{month2|{{{5|{{CURRENTMONTH}}}}}}}} - 1) * 30.5 round 0) 
                     | ( ({{{month2|{{{5|{{CURRENTMONTH}}}}}}}} - 1) * 30.5 + 0.9 round 0 ) 
          }} 
        - {{ #ifexpr: ({{{month2|{{{5|{{CURRENTMONTH}}}}}}}} <= 2) | 0 |  
             {{ #ifexpr:    
                     ({{{year2|{{{4|{{CURRENTYEAR}}}}}}}} / 4) = ({{{year2|{{{4|{{CURRENTYEAR}}}}}}}} / 4 round 0)          
                      and ({{{year2|{{{4|{{CURRENTYEAR}}}}}}}} / 100 != {{{year2|{{{4|{{CURRENTYEAR}}}}}}}} / 100 round 0)  
                | 1 | 2 
             }}
          }}
        + {{ #ifexpr: ({{{month2|{{{5|{{CURRENTMONTH}}}}}}}} <= 2) | 0 |
             {{ #ifexpr: 
                     ({{{year2|{{{4|{{CURRENTYEAR}}}}}}}} / 400) = ({{{year2|{{{4|{{CURRENTYEAR}}}}}}}} / 400 round 0) 
                | 1 | 0 
             }}
          }} 
        + {{{day2|{{{6|{{CURRENTDAY}}}}}}}}
 }}{{#ifexpr: {{{year2|{{{4|{{CURRENTYEAR}}}}}}}} < 1 |
        _ERROR - Can not handle dates before January 1, 1 A.D.
   }}
        - {{#expr: 
        

        + (({{{year1|{{{1|{{CURRENTYEAR}}}}}}}} - 1) * 365)
        + ((({{{year1|{{{1|{{CURRENTYEAR}}}}}}}} - 1) - (({{{year1|{{{1|{{CURRENTYEAR}}}}}}}} - 1) mod 4)) / 4)     
        - ((({{{year1|{{{1|{{CURRENTYEAR}}}}}}}} - 1) - (({{{year1|{{{1|{{CURRENTYEAR}}}}}}}} - 1) mod 100)) / 100) 
        + ((({{{year1|{{{1|{{CURRENTYEAR}}}}}}}} - 1) - (({{{year1|{{{1|{{CURRENTYEAR}}}}}}}} - 1) mod 400)) / 400) 

       
 
        + {{ #ifexpr:     
                     ({{{month1|{{{2|{{CURRENTMONTH}}}}}}}} - 1) < 8 
                     | ( ({{{month1|{{{2|{{CURRENTMONTH}}}}}}}} - 1) * 30.5 round 0) 
                     | ( ({{{month1|{{{2|{{CURRENTMONTH}}}}}}}} - 1) * 30.5 + 0.9 round 0 ) 
          }} 
        - {{ #ifexpr: ({{{month1|{{{2|{{CURRENTMONTH}}}}}}}} <= 2) | 0 |  
             {{ #ifexpr:    
                     ({{{year1|{{{1|{{CURRENTYEAR}}}}}}}} / 4) = ({{{year1|{{{1|{{CURRENTYEAR}}}}}}}} / 4 round 0)          
                      and ({{{year1|{{{1|{{CURRENTYEAR}}}}}}}} / 100 != {{{year1|{{{1|{{CURRENTYEAR}}}}}}}} / 100 round 0)  
                | 1 | 2 
             }}
          }}
        + {{ #ifexpr: ({{{month1|{{{2|{{CURRENTMONTH}}}}}}}} <= 2) | 0 |
             {{ #ifexpr: 
                     ({{{year1|{{{1|{{CURRENTYEAR}}}}}}}} / 400) = ({{{year1|{{{1|{{CURRENTYEAR}}}}}}}} / 400 round 0) 
                | 1 | 0 
             }}
          }} 
        + {{{day1|{{{3|{{CURRENTDAY}}}}}}}}
 }}{{#ifexpr: {{{year1|{{{1|{{CURRENTYEAR}}}}}}}} < 1 |
        _ERROR - Can not handle dates before January 1, 1 A.D.
   }} }} }}</includeonly>