Working with dates - iOS - Firebase
<p>I would like to know what is the best way of working with dates in IOS with a Firebase back-end.</p>

<p>In my App, I've got events and users are allowed to post data until a specific datetime. How can I prevent the user of modifying his system date to be able to do changes to the events while it should not be possible??
How do we typically prevent these cases in iOS? 
I now that we could work with the timestamp from Firebase, but it is a bit annoying to request the timestamp each time you need to work with dates..</p>

<p>Thanks for the help,</p>

<p>Henry</p>