how to convert my TIMESTAMP to UTC timestamp in magento

Question

i found many articals on this but none of give proper soluation

my current system timezone is = 'asia/Kolkata'

my current magento timezone is 'asia/shanghai'

this give me de correct UTC time here system time is '2013-06-26 15:34:00'

   $timezone = date_default_timezone_get();
   date_default_timezone_set($timezone);

   $now = Mage::getModel('core/date')->timestamp(time());
   $current_date= date('Y-m-d H:i:s');

so here $current_date = '2013-06-26 18:04:30'

but i have another mytimestamp..... ex :- $time = '2013-06-26 15:34:00';

   $scheduletime = '2013-06-26 15:19:00';
   $dateTimestamp = Mage::getModel('core/date')->timestamp(strtotime($scheduletime));
   $schedule_time = date('Y-m-d H:i:s',strtotime($scheduletime));

so here $schedule_time = '2013-06-26 23:34:00'

so actually what i want is to get difference between this two time and it should be : 0

Answer 1

Try

Mage::getSingleton('core/date')->gmtDate();

Note: UTC and GMT are equal.

Answer 2

Use strtotime to generate a timestamp from the given string (interpreted as local time) and use gmdate to get it as a formatted UTC date back.

For example

As requested, here’s a simple example:

echo gmdate('d.m.Y H:i', strtotime('2012-06-28 23:55'));

or you can also use local setting with store like below

Mage::app()->getLocale()->storeDate(
            $this->getStore(),
            Varien_Date::toTimestamp($this->getCreatedAt()),
            true
        );

where $this->getCreatedAt() your Database date.