Math Utilities
The class com.quartercode.quarterbukkit.api.MathUtil
contains all Math API functions.
Temporal Conversion
For converting time between different units (ticks and millisecondss), you can use the following methods:
public static long getTicks(long millis) // Convert milliseconds to ticks
public static long getMillis(long ticks) // Convert ticks to milliseconds
For more information, you can use the JavaDocs.