Clock App missing!?

The Clock App on my iPhone is gone! It does not appear on any of the (3) pages of apps I have installed on my iPhone. Since, as far as I know, it's a "standard application" that cannot be uninstalled, I have no idea how it could go missing, nor what process I use to re-install it. When I search the iTunes App Store for an application named "Clock" created by Developer named "Apple" the search results are empty. I use its alarm and timer functions quite a bit, so any help you can offer on how to restore it, will be appreciated.