Time/Date conversion year/week -> day/month/year

[ronverdonk]

NO sir! Leap year handling is in the code already, otherwise it would not have worked for 2008! The leap year handling is done in the following statements in the code[php]if ($year % 4 == 0)
for ($i=1; $i<12; $i++)
$monthtab[$i]++;[/php]
and you don't want to worry about 400-year cycle because the previous one was 1600 and the next one is 2400. And the strtotime routine does not go that far (just until 2032(?).

Ronald

[TheServant]

Good point. I forgot the dates don't go back that far! And I didn't realize that it only goes upto 2032?! That's no good. Means that we will have to recode with a new date function :P

Ron, what does the line: if ($year % 4 == 0) mean?

[ronverdonk]

Ron, what does the line: if ($year % 4 == 0) mean?

This uses the modulo operator. The modulo operation finds the remainder of division of one number by another.

Given two numbers, $year (the dividend) and 4 (the divisor), a modulo 4 is the remainder, on division of $year by 4. For instance, the expression "2008 mod 4" would evaluate to 0, while "2007 mod 4" would evaluate to 3.

So when the modulo 4 of year is zero, it is a leap year.

Ronald

[TheServant]

This uses the modulo operator. The modulo operation finds the remainder of division of one number by another.

Given two numbers, $year (the dividend) and 4 (the divisor), a modulo 4 is the remainder, on division of $year by 4. For instance, the expression "2008 mod 4" would evaluate to 0, while "2007 mod 4" would evaluate to 3.

So when the modulo 4 of year is zero, it is a leap year.

Ronald

So:
[PHP]5 %4 = 0.25
4 %4 = 0
26 %6 = 0.333
30 %6 = 0[/PHP]Just making sure I understand, because this is useful!

[ronverdonk]

No sir, the modulus is the remainder of the division, e.g. 4 mod 3 = 1 because when you divide 4 by 3 the remainder is 1. So:

5 % 4 = 1
4 % 4 = 0
26 % 6 = 2
30 % 6 = 0

E.g. n mod 2 is often used to 'flip' between 2-entry indices or determine if a number is even or uneven, i.e. 1%2 = 1, 8%2 = 0, 133%2=1, 8490%2=0, etc.

Ronald

[TheServant]

I understand. Thanks for that lesson.

[ronverdonk]

I understand. Thanks for that lesson.

You are most welcome.

Ronald