My first thought to the poem was being an alcoholic is difficult. And i still believe that to be true. But i believe that this poem holds something deeper than that. The first line confuses me a bit but the only thing i can think of is daylight savings time. I think it just hit me.
The first line does represent savings time, and that even though you "saved" an hour the thing you drank is still gone in the same amount of time.
I do like how you go deeper into this with emotions and the one word i will point out is bottle. In my mind as the reader I've heard bottle referred to as an alcoholic. I like the sadness you give the reader because if you look deeper, the bottle is this persons only friend and once its gone its gone for good.