<!--jodatime-->
<dependency>
    <groupId>joda-time</groupId>
    <artifactId>joda-time</artifactId>
    <version>2.10</version>
</dependency>

DateTimeFormatter fmt = DateTimeFormat.forPattern("yyyy-MM-dd");
DateTime dateTime = DateTime.parse(date, fmt);

DateTimeFormatter format = DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss");
DateTime dt = DateTime.parse(dateStr, format);

DateTimeFormatter format = DateTimeFormat.forPattern("EEE MMM dd HH:mm:ss yyyy").withLocale(Locale.ENGLISH);
DateTime dt = DateTime.parse(dateStr, format);

String date = dt.toString("yyyy-MM-dd");
String datetime = dt.toString("yyyy-MM-dd HH:mm:ss");
String datetime = dt.toString("yyyy-MM-dd HH:00:00"); // 整点

DateTime now = new DateTime();

Days.daysBetween(dateTime, now).getDays() > 7

DateTime now = new DateTime(DateTimeZone.UTC);