Game rule no longer works

http://www.minecraftwiki.net/wiki/Commands

https://mojang.com/2013/06/minecraft-snapshot-13w24a/

Update: A ‘b’ version has been released and is available through the launcher. Scroll down for server links and bug fix list!

We’ve been working really hard on the new Resource Pack system, and we think it’s at the point where we can finally push it live. This is a huge step forward for the future plugin API and will replace texture packs. Unfortunately, texture packs will no longer be supported but you can use this fancy tool to automatically convert them! Please report all issues about resource packs, and the snapshot in general, to our bug tracker!

Removed Texture Pack support, added Resource Packs
Added new gamerule for day-night cycle
Things and stuff
[BUG MC-1202] – Mobs spawn and then quickly despawn in peaceful. Looks like the "ender-porting-out-of-water" effect.
[BUG MC-2097] – You can't get "The End?" achievement
[BUG MC-2419] – Persistence required tag freezes mobs
[BUG MC-2559] – Squids taking damage while in water
[BUG MC-2692] – Hard to spawn Squids
[BUG MC-15058] – Scoreboard "health" objective set to display "belowname" disconnecting player on multiplayer with end of stream
[BUG MC-16149] – Lava texture animation moves too fast / Animated textures ignoring text files

Checkout the correct usage of gamerule commands in the link I provided: gamerule <rulename> [true | false]

I dont think that I had used the /gamerule thing first time. iether way thanks... I feel like an idiot now.