Philip Hallstrom wrote in post #937228:

> Just for the sake of argument... how about the time it takes runners to
> finish a marathon?  Sure you could use seconds as an integer field, but
> time without date make sense...

I'm currently developing application, where I need to store beginning 
date (date only, without time) and amount of time passed.

I found a gem, that deals with 'time without date' issue: 
https://github.com/lailsonbm/time_of_day

It can be useful in some cases.

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