DateTimeUtils.java

public class DateTimeUtils {
    
    public static final int SECONDS_IN_DAY = 86400;

    public static long currentTimeInSecondsGMT() {
        return System.currentTimeMillis()/1000;
    }
    
    public static long lastMidnightTimeInSecondsGMT() {
        return (currentTimeInSecondsGMT() / SECONDS_IN_DAY) * SECONDS_IN_DAY;
    }
    
    public static long secondsSinceLastMidnightGMT() {
        return currentTimeInSecondsGMT() % SECONDS_IN_DAY;
    }
    
}