Dates

As a rule of thumb, always pass dates to Smarty as timestamps. This allows template designers to use the date_format modifier for full control over date formatting, and also makes it easy to compare dates if necessary.

Example 18-4. Using date_format

{$startDate|date_format}

This will output:

Jan 4, 2009

{$startDate|date_format:"%Y/%m/%d"}

This will output:

2009/01/04

Dates can be compared in the template by timestamps with:

{if $order_date < $invoice_date}
   ...do something..
{/if}

When using {html_select_date} in a template, the programmer will most likely want to convert the output from the form back into timestamp format. Here is a function to help you with that.

Example 18-5. Converting form date elements back to a timestamp


<?php

// this assumes your form elements are named
// startDate_Day, startDate_Month, startDate_Year

$startDate = makeTimeStamp($startDate_Year, $startDate_Month, $startDate_Day);

function makeTimeStamp($year='', $month='', $day='')
{
   if(empty($year)) {
       $year = strftime('%Y');
   }
   if(empty($month)) {
       $month = strftime('%m');
   }
   if(empty($day)) {
       $day = strftime('%d');
   }

   return mktime(0, 0, 0, $month, $day, $year);
}
?>

Dates

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