PHP/Date/cal to jd

Using the French Republican calendar

   <source lang="html4strict">

<?php $jd = cal_to_jd(CAL_FRENCH, 8, 13, 11); $french = cal_from_jd($jd, CAL_FRENCH); $gregorian = cal_from_jd($jd, CAL_GREGORIAN); ?>

 </source>
   
  

Using the Jewish calendar

   <source lang="html4strict">

<?php $jd = cal_to_jd(CAL_JEWISH, 6, 14, 5761); $jewish = cal_from_jd($jd, CAL_JEWISH); $gregorian = cal_from_jd($jd, CAL_GREGORIAN); ?>

 </source>
   
  

Using the Julian calendar

   <source lang="html4strict">

<?php $jd = cal_to_jd(CAL_JULIAN, 2, 29, 1900); $julian = cal_from_jd($jd, CAL_JULIAN); $gregorian = cal_from_jd($jd, CAL_GREGORIAN); ?>

 </source>