PHP: strtotime() - consistent results

How venerable is this to the settings of the server? 
echo date('F j, Y',strtotime('2015-2-7'));

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In some locations, 2015-2-7 could be considered February 7, while in other places it could be considered to be July 2.  What is the most foolproof way to create a timestamp from  a day, month and year?
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skijAsked:
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Ray PaseurCommented:
Use the ISO-8601 standard for all internal representations of date/time values.  Reformat for printing or display.
http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/A_201-Handling-date-and-time-in-PHP-and-MySQL.html

Test some with Practical Application #7.  You will find that dashes and slashes have different meanings to strtotime().
http://php.net/manual/en/datetime.formats.php

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Julian HansenCommented:
By convention the format 2015-07-20 (uses dashes) is in UTC format (yyyy-mm-dd)

If you use slashes (2015/20/07) then it is in US format (yyyy/mm/dd)
Ray PaseurCommented:
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