Date Ranges by quarters

I am trying to set a start date and end date by the quarter.

For example, I am working on a reporting system where i need to report data for quarter 1, quarter 2, quarter 3, and quarter 4.

Quarter One - January - March
Quarter Two - April - June
Quarter Three - July - September
Quarter Four - October - December

I have for example some cases for the current month, and the previous month as shown below.

       case 'this_month':
          $start_date = date(DATE_FORMAT, mktime(0, 0, 0, date("m"), 1, date("Y")));
          $end_date = date(DATE_FORMAT, mktime(0, 0, 0, date("m"), date("d"), date("Y")));
        break;
        case 'last_month':
          $start_date = date(DATE_FORMAT, mktime(0, 0, 0, date("m") - 1, 1, date("Y")));
          $end_date = date(DATE_FORMAT, mktime(0, 0, 0, date("m"), 0, date("Y")));
        break;

But now i need to add cases for each quarter and I am not sure how to actually do that so it reflects the proper quarter range, like quarter 1 always being January thru March.

Any Ideas?
redcableAsked:
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TedInAKConnect With a Mentor Commented:
The following two functions should do what you need.  If the month is a single digit, e.g., '7', a zero is prepended - '07'.

function getQuarterStart($quarterNum) {
      return str_pad($quarterNum * 3 - 2, 2, '0', STR_PAD_LEFT) . '/01';
}

function getQuarterEnd($quarterNum) {
      return str_pad($quarterNum * 3, 2, '0', STR_PAD_LEFT) . '/' . cal_days_in_month(CAL_GREGORIAN, $quarterNum * 3, date('Y'));
}

Usage:
$qNum = 4;
echo 'Start: ' . getQuarterStart($qNum) . '/' . date('Y') . '<br>';
echo 'End: ' . getQuarterEnd($qNum) . '/' . date('Y');

Output:
   Start: 10/01/2006
   End: 12/31/2006
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John KawakamiCommented:
$periods[1] = array( 'start'=>'1/1' , 'end'=>'3/31' );
$periods[2] = array( 'start'=>'4/1' , 'end'=>'6/30' );
$periods[3] = array( 'start'=>'7/1' , 'end'=>'9/30' );
$periods[4] = array( 'start'=>'10/1' , 'end'=>'12/31' );

// you might want to append the year to the dates, programatically
$q = 1;

$query = "select data from table where date >= '".$periods[$q]['start'] ."' and date <= '" . $periods[$q]['end'] ."'"

That gets a single quarter of data.

If you need to group results by the quarter, you should add a column to the data (either permanently or in a temporary table), that stores the quarter.  Then, all you need to do is "group by quarter".  (If you're going to run this query a lot, just add the column as a permanent thing and add code to insert the proper quarter.)
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redcableAuthor Commented:
not exactly what i was looking for. is there way using this format

date(DATE_FORMAT, mktime(0, 0, 0, date("m") - 1, 1, date("Y")));

to make that mean 1/1/current year.
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John KawakamiCommented:
Sorry about that - I misinterpreted the code.  TedInAK's right.

If you need to get from the current month to the quarter number:

$quarter = floor( $month / 4 ); // where month is 0 to 11

Then use those two functions to get the dates.
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