How to obtain the end of the day when given a LocalDate?

Here are a few alternatives, depending on what you need:

LocalDate.now().atTime(23, 59, 59);     //23:59:59
LocalDate.now().atTime(LocalTime.MAX);  //23:59:59.999999999

But there is no built-in method.

As commented by @JBNizet, if you want to create an interval, you can also use an interval up to midnight, exclusive.

public static long getStartOfDay(String country) {
    return LocalDate.now().atStartOfDay(ZoneId.of("Europe/Berlin")).toInstant().toEpochMilli();
}

public static long getEndOfDay(long startOfDay) {
    return startOfDay + 86399000L;  // adding 24h = 1day seconds - 1
}

public static long getStartOfDay(LocalDate localDate, String country) {
    return localDate.atStartOfDay(ZoneId.of("Europe/Berlin")).toInstant().toEpochMilli();
}

public static long getEndOfDay(LocalDate localDate, String country) {
    localDate = localDate.plusDays(1L);
    return localDate.atStartOfDay(ZoneId.of("Europe/Berlin")).toInstant().toEpochMilli() - 1000L; //substract mili
}

These are the variants available in LocalTime, notice MIDNIGHT and MIN are equal.

LocalDate.now().atTime(LocalTime.MIDNIGHT); //00:00:00.000000000
LocalDate.now().atTime(LocalTime.MIN);      //00:00:00.000000000
LocalDate.now().atTime(LocalTime.NOON);     //12:00:00.000000000
LocalDate.now().atTime(LocalTime.MAX);      //23:59:59.999999999

For reference, this is the implementation in java.time.LocalTime

/**
 * Constants for the local time of each hour.
 */
private static final LocalTime[] HOURS = new LocalTime[24];
static {
    for (int i = 0; i < HOURS.length; i++) {
        HOURS[i] = new LocalTime(i, 0, 0, 0);
    }
    MIDNIGHT = HOURS[0];
    NOON = HOURS[12];
    MIN = HOURS[0];
    MAX = new LocalTime(23, 59, 59, 999_999_999);
}

If the value assigned to the 4th constructor argument (999_999_999) of LocalTime (representing nanoOfSecond) looks unfamiliar it's because it's making use of the Java 7 feature Underscores in Numeric Literals.

In Java SE 7 and later, any number of underscore characters (_) can appear anywhere between digits in a numerical literal. This feature enables you, for example, to separate groups of digits in numeric literals, which can improve the readability of your code.

Get start of next day and subtract 1 second from it. This should work for you. :

public static void main(String[] args) {

    LocalDate date = LocalDate.now();
    LocalDateTime dt = date.atStartOfDay().plusDays(1).minusSeconds(1);
    System.out.println(dt);
}

O/P :

2016-04-04T23:59:59