Different start time of offer when editing and on detail page

Start time on detail page of the offer:
![Detail page](https://f.cloud.github.com/assets/98588/811173/201b0fac-eecc-11e2-9df6-71dea3a05d77.png)

Start time when editing the offer
![Editing](https://f.cloud.github.com/assets/98588/811174/203c7f0c-eecc-11e2-8c05-a10e5c18e1b3.png)

Times should be the same. Difference is probably caused by time difference between BST and GMT (which is +1 hour).