How do I make this date thing?

[brad62]

I just don't get it. A mess for me when making a date thing here.
I've tried a lot of things, but I think I might be close to a solution here, even though there is something all wrong here.

I want to print what week it is 70 days earlier than today.
And it has to be 70 days before, since there are different number of weeks some years.
This is what I've got so far, but it's not working.

$then = now()-70;
$timestamp  = $then;
$showdate = date("W", $timestamp); 

[stereofrog]

Give strtotime a chance

$then = strtotime("70 days ago");
echo date("W", $then); 

[Raju Gautam]

See this

echo date('W',strtotime("-70 days")); 

It will show 17th week of this year 2007

Do you mean that?

[brad62]

That last thing worked really good.

Now I want to make a dropdown, so people can pick that week or a week that is earlier. Like a dropdown containing last week and 10 weeks before.
So I did make some stuff and make their choice as a session. Then it can be remembered while visiting the site.

I guess my way doing this is way too complicated. There is probably a better way to make this work. But I'm always a newbie I guess...

This is my way of doing this dropdown, which is not working (of course)

<form name="weekchoice" id="weekchoice" method="post" action="<?php session_register('weekchoice');
        $_SESSION['weekchoice'] = $_GET['weekchoice']; ?>">
  <select name="weekchoice">
      <option value="<?php echo $backone; ?>"<?php if (!(strcmp(1, $_GET['weekchoice']))) {echo "SELECTED";} ?>><?php echo $backone; ?></option>
    <option value="<?php echo $backtwo; ?>"<?php if (!(strcmp(1, $_GET['weekchoice']))) {echo "SELECTED";} ?>><?php echo $backtwo; ?></option>
        <option value="<?php echo $backthree; ?>"<?php if (!(strcmp(1, $_GET['weekchoice']))) {echo "SELECTED";} ?>><?php echo $backthree; ?></option>
    <option value="<?php echo $backfour; ?>"<?php if (!(strcmp(1, $_GET['weekchoice']))) {echo "SELECTED";} ?>><?php echo $backfour; ?></option>
        <option value="<?php echo $backfive; ?>"<?php if (!(strcmp(1, $_GET['weekchoice']))) {echo "SELECTED";} ?>><?php echo $backfive; ?></option>
    <option value="<?php echo $backsix; ?>"<?php if (!(strcmp(1, $_GET['weekchoice']))) {echo "SELECTED";} ?>><?php echo $backsix; ?></option>
    <option value="<?php echo $backseven; ?>"<?php if (!(strcmp(1, $_GET['weekchoice']))) {echo "SELECTED";} ?>><?php echo $backseven; ?></option>
    <option value="<?php echo $backeight; ?>"<?php if (!(strcmp(1, $_GET['weekchoice']))) {echo "SELECTED";} ?>><?php echo $backeight; ?></option>
        <option value="<?php echo $backnine; ?>"<?php if (!(strcmp(1, $_GET['weekchoice']))) {echo "SELECTED";} ?>><?php echo $backnine; ?></option>
    <option value="<?php echo $backten; ?>"<?php if (!(strcmp(1, $_GET['weekchoice']))) {echo "SELECTED";} ?>><?php echo $backten; ?></option>
  </select>
  <br />
  <input type="submit" name="Submit" value="SHOW WEEK" />
</form>