I'm sorry, but if you have an application dealing with time and you want to even think of defining a behavior independent of time zone, you should still be storing values in UTC.
Your example may work fine on a server that you control, but let's say your use case is a phone alarm program. You can't guarantee that your application will know when it's 7:30AM in the local time, but you can guarantee what the time is in UTC and not need network or the device's help to do it.
So now the time format you store depends on the architecture of your platform? What if you have to send this data between platforms now? Am I going to have to convert back and forth for each message? No thanks. I'll just store everything as UTC and stay sane.
Your example may work fine on a server that you control, but let's say your use case is a phone alarm program. You can't guarantee that your application will know when it's 7:30AM in the local time, but you can guarantee what the time is in UTC and not need network or the device's help to do it.
So now the time format you store depends on the architecture of your platform? What if you have to send this data between platforms now? Am I going to have to convert back and forth for each message? No thanks. I'll just store everything as UTC and stay sane.