Template:Orddate

{{#expr: {{#switch: 04|1=365|2=396|3=59|4=90|5=120|6=151|7=181|8=212|9=243|10=273|11=304|12=334|badmonth}} +25 +( 365.25* (2024-(04<3)) -0.375 round 0) - ( 365.25* 2024- .25 -0.375 round 0) -(2024>=0)*

(
( (2024-(04<3)) /100 -0.495 round 0) 

-( (2024-1) /100 -0.495 round 0) -( (2024-(04<3)) /400 -0.49875 round 0) +( (2024-1) /400 -0.49875 round 0)) }}

Finds the ordinal date within a year.

Example:

Template:Evaldemo/3

Check the result at tycho.usno.navy.mil after Template:Purge this page.

Examples for 15-MAR-2007 and 15-MAR-2008 (leap year):

Template:Evaldemo/3

Template:Evaldemo/3

Optional substitution works if all three variables are specified:

{{ subst:orddate|year|month|day|subst=subst:}}