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Thanks for attending my talk "Time Zones and Calendars are a PITA" at Dutch PHP Conference that I gave on June 8th, 2019. Here you can find some extra information about the talk if they are available. For this talk we have:


If you have any questions about the talk, feel free to contact me. My details are on the contact page.


There is a recording of this talk available at


The talks slides can be downloaded at time-dpc19.pdf



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Clear explanation, give some clarity on how and why some wierd stuff sometimes cames. Even if I know a lot on this, I still discover new stuff. it was clear. thanks

A great talk about Time and Timezones. The quiz at the start was a nice touch. The PHP Date library is great to work with and Derick explained well how it will interpreted input. Great talk and thanks for the great work Derick. A little advice. If you start drinking coffee, not minutes before the talk and no three cups at once ;)

The only real downside to this talk was the fact that I couldn’t keep up with my notes. So many knowledge bombs were shared in this great talk. The quiz was also a really nice touch.

I expected to hear nothing new, just picked the talk because Derick is a good speaker. However, I heard a lot of new things. Nothing spectacular, just a lot of gotcha's, emphasizing what we all know: don't roll your own, just use DateTime and DateInterval.