making a 2 week interval select box

[Nico]

I need to make a select box that prints 2 week intervals.

I want the top value to be a future interval (i.e. today is 2004-01-29, I'd like it to display 2004-02-01. On 2004-02-02 I'd like it to display 2004-02-15).

I'd like the rest of the select box values to be in the past, up to a year ago. When the next 2 week interval comes around, it drops the last date and adds the next.

I know I need to make a function for this and I've tried to make some, however I have failed. Can someone help me out with making this?

Thanx a ton!

Nico

[petitduc]

1. Convert the base date into a UNIX timestamp using mktime();

2. You get the number of seconds since 1,1,1970.
   Add or subtract to this number 86400 number of days you want to add or subract, to it, for example 1586400.

3 Convert back this new number to a date using the date() function.

This function for example wraps all the operations :

function addDays($year,$month,$day,$daystoadd) {
   $secondsInDay = 86400;
   $timestamp = mktime(0,0,0,$month,$day,$year);
   $timestamp += $daystoadd * $secondsInDay;
   return date("Y-m-d",$timestamp);
}

if you need to subtract days you can give it a negative number as 4th parameter.
One should add date checking to this but you can start from there...

[Nico]

I have something similar to your function however I don't know how to incorporate it into a loop.

Lets say the base date to calculate the 2 weeks interval from is 1999-05-02.

I can calculate the next 2 week period, however I don't know how to continually calculate it and only display one date in the future and the rest be in the past.

I want it to display 2004-02-01 thru "whatever 25 2 week intervals in the past is" I don't want all the way to 1999.

How do I get a loop to figure out what a single 2 week interval in the future is, based off the current date and the start date?

Nico

[Weedpacket]

[man]strtotime[/man] might be a more flexible function to use - not all days have 86400 seconds in them.
You can say strtotime( (-2$i)." weeks") to get the time 2$i weeks in the past (where $i runs from 0 to 25). If the timestamp returned is less than that returned by mktime(0,0,0,1,1,2000) then it's in 1999 and you can use [man]break[/man] to abort the loop and stop it from going further.

And if you want a single 2-week interval in the future, you don't need a loop.