Date Math

I need to get the difference in months between two dates. The dates =
could be as much as 60 months apart. Is there any easy way to do this =
either through PHP or MySQL? I know how I can do it through code but =
thought there might be a simple one or two line option.

Thanks!
Floyd


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Re: Date Math

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On Tue, Apr 20, 2010 at 11:40 AM, Floyd Resler wrote:

> I need to get the difference in months between two dates. The dates could
> be as much as 60 months apart. Is there any easy way to do this either
> through PHP or MySQL? I know how I can do it through code but thought there
> might be a simple one or two line option.
>
>
check out:
http://dev.mysql.com/doc/refman/5.1/en/date-and-time-functio ns.html

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Re: Date Math

At 11:40 AM -0400 4/20/10, Floyd Resler wrote:
>I need to get the difference in months between two dates. The dates
>could be as much as 60 months apart. Is there any easy way to do
>this either through PHP or MySQL? I know how I can do it through
>code but thought there might be a simple one or two line option.
>
>Thanks!
>Floyd
>



$date1 = '2009-02-27';
$date2 = '2004-12-03';

$udate1 = strtotime($date1);
$udate2 = strtotime($date2);

$difference = $udate1 - $udate2;

$months_difference = floor($difference / 2678400);

echo("The difference is $months_difference months");

?>

I this will work, but the question of what constitutes a month might
come into play.

Cheers,

tedd
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Re: Date Math

On Tue, Apr 20, 2010 at 03:32:58PM -0400, tedd wrote:

> At 11:40 AM -0400 4/20/10, Floyd Resler wrote:
>> I need to get the difference in months between two dates. The dates
>> could be as much as 60 months apart. Is there any easy way to do
>> this either through PHP or MySQL? I know how I can do it through
>> code but thought there might be a simple one or two line option.
>>
>> Thanks!
>> Floyd
>>
>
>
> >
> $date1 = '2009-02-27';
> $date2 = '2004-12-03';
>
> $udate1 = strtotime($date1);
> $udate2 = strtotime($date2);

$from = getdate($udate1);
$from_year = $from['year'];
$from_month = $from['month'];

$to = getdate($udate2);
$to_year = $to['year'];
$to_month = $to['month'];

// Assumes $to_date is later than $from_date

if ($from_year == $to_year)
$months = $to_month - $from_month;
elseif ($to_month >= $from_month) {
$num_years = $to_year - $from_year;
$add_months = $num_years * 12;
$base_months = $to_month - $from_month;
$months = $base_months + $add_months;
}
else { // $to_month < $from_month
$num_years = $to_year - $from_year;
$base_months = $num_years * 12;
$sub_months = $from_month - $to_month;
$months = $base_months - $sub_months;
}

This will give the months between two dates, ignoring the actual day of
the month for each date (may not be exactly what you want, and code is
untested).

>
> $difference = $udate1 - $udate2;
>
> $months_difference = floor($difference / 2678400);
>
> echo("The difference is $months_difference months");
>
> ?>
>
> I this will work, but the question of what constitutes a month might
> come into play.

My code above is submitted because I don't like doing calculations with
seconds. Tedd's right, the OP's questions can't be answered precisely
because months vary in number of days.

Paul

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Re: Date Math

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On 20 April 2010 17:40, Floyd Resler wrote:

> I need to get the difference in months between two dates. The dates could
> be as much as 60 months apart. Is there any easy way to do this either
> through PHP or MySQL? I know how I can do it through code but thought there
> might be a simple one or two line option.
>
> Thanks!
> Floyd
>
>
You're best off doing this in MySQL.
Something like select timestampdiff(month, '2010-01-01', '2010-05-22');
should work.

Michiel

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Re: Date Math

On Apr 21, 2010, at 5:39 AM, Michiel Sikma wrote:

> On 20 April 2010 17:40, Floyd Resler wrote:
>=20
>> I need to get the difference in months between two dates. The dates =
could
>> be as much as 60 months apart. Is there any easy way to do this =
either
>> through PHP or MySQL? I know how I can do it through code but =
thought there
>> might be a simple one or two line option.
>>=20
>> Thanks!
>> Floyd
>>=20
>>=20
> You're best off doing this in MySQL.
> Something like select timestampdiff(month, '2010-01-01', =
'2010-05-22');
> should work.
>=20
> Michiel

Perfect! That's exactly what I was looking for!=

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