Yesterday/Today checker for java 8 or https://github.com/ThreeTen/threetenbp

LocalDateTimeYesterdayChecker.java

// implementation 'com.github.ThreeTen:threetenbp:v1.3.6'
// https://github.com/ThreeTen/threetenbp
// similar to java8, but support jdk6 and jdk7
import org.threeten.bp.LocalDateTime;
import org.threeten.bp.format.DateTimeFormatter;
import org.threeten.bp.temporal.ChronoUnit;

public class LocalDateTimeYesterdayChecker {

    public static LocalDateTime getYesterday() {
        return LocalDateTime.now().minus(1, ChronoUnit.DAYS);
    }

    public static boolean isYesterday(LocalDateTime localDateTime) {
        DateTimeFormatter formatter = DateTimeFormatter.ISO_LOCAL_DATE;
        String localDateTimeText = localDateTime.format(formatter);
        String yesterdayText = getYesterday().format(formatter);
        return yesterdayText.equals(localDateTimeText);
    }

    public static boolean isToday(LocalDateTime localDateTime) {
        DateTimeFormatter formatter = DateTimeFormatter.ISO_LOCAL_DATE;
        String localDateTimeText = localDateTime.format(formatter);
        String todayText = LocalDateTime.now().format(formatter);
        return todayText.equals(localDateTimeText);
    }
}

OffsetDateTimeYesterdayChecker.java

// implementation 'com.github.ThreeTen:threetenbp:v1.3.6'
// https://github.com/ThreeTen/threetenbp
// similar to java8, but support jdk6 and jdk7
import org.threeten.bp.OffsetDateTime;
import org.threeten.bp.format.DateTimeFormatter;
import org.threeten.bp.temporal.ChronoUnit;

public class OffsetDateTimeChecker {

    public static OffsetDateTime getYesterday() {
        return OffsetDateTime.now().minus(1, ChronoUnit.DAYS);
    }

    public static boolean isYesterday(OffsetDateTime offsetDateTime) {
        DateTimeFormatter formatter = DateTimeFormatter.ISO_OFFSET_DATE;
        String offsetDateTimeText = offsetDateTime.format(formatter);
        String yesterdayText = getYesterday().format(formatter);
        return yesterdayText.equals(offsetDateTimeText);
    }

    public static boolean isToday(OffsetDateTime offsetDateTime) {
        DateTimeFormatter formatter = DateTimeFormatter.ISO_LOCAL_DATE;
        String offsetDateTimeText = offsetDateTime.format(formatter);
        String todayText = OffsetDateTime.now().format(formatter);
        return todayText.equals(offsetDateTimeText);
    }
}