time(void)

<?php
   time = time();
   print("Current Timestamp: ".time);
?>

Current Timestamp: 1591606322

<?php
   $dateString = '11-06-2012 12:50 GMT';
   print("Date: " . date("D M d Y"));
   print("\n");
   print("Sunset time: ");
   print(date_sunset(time(),SUNFUNCS_RET_STRING,38.4,-9,90,1));
   print("\n");
   print("Sunrise time: ");
   print(date_sunrise(time(),SUNFUNCS_RET_STRING,38.4,-9,90,1));
?>

Date: Fri May 08 2020
Sunset time: 20:31
Sunrise time: 06:33

<?php
   timestamp1 = time() - (23*12*30);
   print_r(timestamp1); 
   print("\n");
   timestamp2 = time() + (23*12*30);
   print_r(timestamp2); 
?>

1588935317
1588951877

<?php
   nextWeek = time() + (7 * 24 * 60 * 60);     echo 'Now:       '. date('Y-m-d') ."\n";
   echo 'Next Week: '. date('Y-m-d',nextWeek) ."\n";
?>

Now: 2005-03-30
Next Week: 2005-04-06