Calculators
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<?php
// PHP Function to calculate UK Inland Revenue tax week from passed date
// Parameters:
// $dd - day of month, 0-31
// $mm - month of year, 0-12
// $yy - Year (4 digits better!)
//
// I have not implemented error checking on parameters - its down to you to make sure params are correct!
//
// Warranties - NONE, (but its not rocket science!)
//
// Copyright: D B Shields, Broadowler Systems Ltd, 2003
//
// Contact: david@broadowler.co.uk
//
// Licence : Free to use, but dont sell it!
//
function taxweek($dd, $mm, $yy){
// Inland Revenue defined Week 1 as 6-12 April inclusive, Week 2 13-19 inclusive etc.
// NB Day of week has NO bearing on week number - tax week may start on ANY day
// first, stamp the supplied date
$now=mktime(0,0,0,$mm,$dd,$yy);
// next, see where april first is for supplied year
$apryy=$yy;
$apr6=mktime(0,0,0,4,6,$apryy);
if ($apr6>$now){
// we are in jan-apr, so apr1 needs to be prev year
$apryy--;
}
$apr6=mktime(0,0,0,4,6,$apryy);
// now how many weeks have elapsed between w1start and now ?
$elapsed=($now-$apr6)/86400;
$w=sprintf("%0.2f",$elapsed/7);
$wf=floor($w)+1; // not cel, as breaks boundaries
return $wf;
}
?>
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Usage Example
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$w=taxweek(7,4,2002); // returns 1
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