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Changing find_day_in_month() to conform with the new definitions of DST presets.

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Adding function dayofweek (centralization, this might also be helpful in fixing a bug).
This commit is contained in:
defacer 2005-02-26 06:26:04 +00:00
parent d7d93ee995
commit 8dc3f6cf5e
1 changed files with 47 additions and 27 deletions
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74
lib/moodlelib.php
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@ -962,51 +962,71 @@ function dst_offset_on($time) {
}
// "Find the ($index as int, 1st, 2nd, etc, -1 = last) ($weekday as int, sunday = 0) in ($month) of ($year)"
function find_day_in_month($index, $weekday, $month, $year) {
$daysinmonth = days_in_month($month, $year);
if($weekday == -1) {
// Any day of the week will do
if($index == -1) {
// Last day of that month
$targetday = days_in_month($month, $year);
// Don't care about weekday, so return either $index or $daysinmonth
return ($index == -1) ? $daysinmonth : $index;
}
// From now on we 're looking for a specific weekday
$numweeks = intval($weekday / 7); // 0 for first weekday, 1 for second etc.
$weekday = $weekday % 7;
// Starting from day $index, -1 == last day of month
if($index == -1) {
$lastmonthweekday = strftime('%w', mktime(12, 0, 0, $month, $daysinmonth, $year, 0));
// This is the last such weekday of the month
$lastinmonth = $daysinmonth + $weekday - $lastmonthweekday;
if($lastinmonth > $daysinmonth) {
$lastinmonth -= 7;
}
else {
// Not last day; a straight index value
$targetday = $index;
// Skip the required number of weeks and return
while($numweeks--) {
$lastinmonth -= 7;
}
return $lastinmonth;
}
else {
// We need to calculate when exactly that weekday is
// Fist of all, what day of the week is the first of that month?
$firstmonthweekday = strftime('%w', mktime(12, 0, 0, $month, 1, $year, 0));
$daysinmonth = days_in_month($month, $year);
$indexweekday = strftime('%w', mktime(12, 0, 0, $month, $index, $year, 0));
// This is the first such-named weekday of the month
$targetday = 1 + $weekday - $firstmonthweekday;
if($targetday <= 0) {
$targetday += 7;
$diff = $weekday - $indexweekday;
if($diff < 0) {
$diff += 7;
}
if($index == -1) {
// To find the LAST such weekday, just keep adding 7 days at a time
while($targetday + 7 <= $daysinmonth) {
$targetday += 7;
}
}
else {
// For a specific week, add as many weeks as required
$targetday += $index > 1 ? ($index - 1) * 7 : 0;
// This is the first such weekday of the month equal to or after $index
$firstfromindex = $index + $diff;
// Skip the required number of weeks and return
while($numweeks--) {
$firstfromindex += 7;
}
return $firstfromindex;
}
return $targetday;
}
function days_in_month($month, $year) {
return intval(date('t', mktime(12, 0, 0, $month, 1, $year, 0)));
}
function dayofweek($day, $month, $year) {
// I wonder if this is any different from
// strftime('%w', mktime(12, 0, 0, $month, $daysinmonth, $year, 0));
return intval(date('w', mktime(12, 0, 0, $month, $day, $year, 0)));
}
/// USER AUTHENTICATION AND LOGIN ////////////////////////////////////////
// Makes sure that $USER->sesskey exists, if $USER itself exists. It sets a new sesskey