Dates, times and timezones are a complicated matter to deal with. Luckily, PHP has powerful date/time handling functionality. It allows you to deal with many issues that arise when you are developing applications. This talk will cover advanced functionality of PHP’s date/time functionality and is not an introduction except for where this is necessary. I will cover dealing with timezones, calculations with DateTime objects and tips and tricks for dealing with storing date/time information in a database.

https://www.youtube.com/watch?v=BDH2ji-93ks