Calendar check off
The ChronoUnit enum can calculate elapsed time between a pair of moments. ZonedDateTime now = ZonedDateTime.now( z ) of(int year, int month, int dayOfMonth, int hour, int minute, int second, int nanoOfSecond, ZoneId zone) ZoneId z = ZoneId.of( "America/Montreal" ) ZonedDateTime represents a moment on the timeline with an assigned tim zone ( ZoneId). This work is much easier with the java.time classes. While generalizing makes sense in other frameworks such as Java Collections, not so in java.time. Do not extend java.timeĭo not extend (subclass) the java.time classes (they are marked final).Īnd do not generalize to their interfaces for your business logic stick to the concrete classes of this framework. Never use the 3-4 letter abbreviation such as EST or IST as they are not true time zones, not standardized, and not even unique(!). Specify a proper time zone name in the format of continent/region, such as America/Montreal, Africa/Casablanca, or Pacific/Auckland.
You are using the troublesome old date-time classes such as, , and are now legacy, supplanted by the java.time classes. Because of anomalies, some days start at other time-of-day such as 01:00.
The very meaning of a time zone is to track a history of these anomalies.Īlso, you assume the day starts at midnight. Anomalies such as Daylight Saving Time (DST) mean that days may vary such as 23 hours long, 25 hours, or other numbers.
#CALENDAR CHECK OFF CODE#
You assume in your code that every day is exactly twenty four hours long.