Regardless of whether you plan to pick up a physical copy of Grand Theft Auto 5 or have pre-downloaded it, developer Rockstar has revealed when you'll be able to start playing.
Rockstar is working off British Summer Time, and those in Ireland and the UK will be able to start playing their pre-download at 12am. Across the pond, US and Canadian players will be able to play on April 13th at 16:00 PDT/19:00 EDT.
GTAV for PC will go live on April 14 at 12:00 AM BST (In the US, this is Monday, April 13, at 7:00 PM ET, 4:00 PM PT).
— Rockstar Support (@RockstarSupport) April 10, 2015
Rockstar has said updates and DLC for the PC version will launch at the same time as console. You can check out the game's minimum and recommended specs for the game here.