# Php > Date Time Code Examples

## Calculation of easterday and the holydays depended of easterday

``` Calculation of easterday and the holydays depended of easterday <?php /* goldnum: The Golden Number */ /* epact: Paschal Full Moon */ function easterday (\$year) { \$goldnum = (int) (\$year%19) + 1; \$century = (int) \$year/100 + 1; \$greg_corr = (int) (3*\$century)/4 - 12; \$clav_corr = (int) (\$century - 16 - (\$century-18)/25)/3; \$extra = (int) (5*\$year)/4 - \$greg_corr - 10; \$epact = (int) (11*\$goldnum + 20 + \$clav_corr - \$greg_corr)%30; if (\$epact <= 0 ) \$epact = \$epact + 30; if ((\$epact == 24 || \$epact == 25) && \$goldnum > 11) \$epact = \$epact + 1; \$day = 44 - \$epact; if (\$day < 21) \$day = \$day + 30; \$day = \$day + 7 - ((\$extra+\$day)%7); \$month = 3; if (\$day > 31) { \$month = 4; \$day = \$day - 31; } return mktime(8,0,0,\$month,\$day,\$year); } \$seconds_pr_day = 86400; for (\$i=1990; \$i<=2010; \$i++) { \$easter = easterday(\$i); echo "Easterday: "; echo date("Y-m-d", \$easter); echo " - Pentecost: "; echo date("Y-m-d", \$easter + (49*\$seconds_pr_day)); echo "\n"; } ?> ```