The simple answer is, it depends.
The recipient of the gift has to confirm they wish to take it up before it starts, so the start date will depend on when they do this. Equally, they may choose not to take up the gift - so you may not see their membership start at all. Please remember if this happens that your gift is still a vital donation to the sustainable running of Blipfoto, and very much appreciated.
If they are already a member, your gift membership will be added on to the end of their existing membership.