Currently Being ModeratedJul 15, 2013 4:51 AM (in response to na71)
That is just a filter in the Recents group on the side bar. All your photos should still be in your iPhoto library look in one of the filters in the Library group on the side bar
Currently Being ModeratedJul 15, 2013 8:59 AM (in response to na71)
There are a number of ways. Click on the Event icon and go to the View menu. Select Sort ➙ By Date3 ➙ Descending. The latest events will be at the top of the window. Scroll down till to get to the date you're looking for.
Or use the Search function at the bottom and search by Date:
You can view photos taken on a specific date, week, month or year.
It's very powerful.