Arduino core function to use to show a simple text at a certain time

What arduino core function will I use to show "2014" at exactly midnight on december ? The "2014" text will be made up of LED lights and I want it to automatically light up at midnight.. Thanks

Use whatever code best suits the way you have wired up the LEDs

What arduino core function will I use to show "2014" at exactly midnight on december ?

There isn't one. The Arduino has no idea what time it is. All it knows is how long it has been running. If you tell it that it started at some specific date and time, it can tell you what time it is now. Just don't reset the Arduino between now and the end of the year.

On December what? The 28th?

karl_19:
What arduino core function will I use to show "2014" at exactly midnight on december ? The "2014" text will be made up of LED lights and I want it to automatically light up at midnight.. Thanks

None. Just connect each LED to the power supply with the appropriate series resistor, and turn the power supply on at midnight.