thomascolomba / date-dateswithzoneddatetimethreeten Goto Github PK

Handling some dates with library ThreeTen (to be used before java 8).

How to compile and execute :
I executed it from within eclipse directly.

I) Generalities
a)ZonedDateTime
A date-time with a time-zone in the ISO-8601 calendar system.


b)ZoneId
An ID for a timezone.



II)The code
showYear1970() shows how to represent Unix epoch.
showYearMinus5() shows how to represent a date before current era.
showYearSumerCivilization() shows how to represent early Sumer civilization date (-3400 BC).
showYearTyrannosaurus() shows how to... well, you know.
showAddingHourChangesDay() - showAddingDayChangesMonth() - showAddingDayChangesYear() - showAddingMonthChangesYear() shows how to add days/month to a ZonedDateTime through a java.util.ZonedDateTime.
showLeapAndNonLeapYear() tells whether a year is leap or not.
showDifferencesBetweenDifferentTimezones() shows that same "day/month/year" are different depending on the timezone.
showAllTimezonesAvailable() shows the timezones available.
showSomeDatesThroughPatterns() shows how to print dates with different formats, ex : "dd/MM/yyyy", "yyyy.MM.dd HH:mm:ss", "yyyy-MM-dd'T'HH:mm:ss.SSSXXX"...
showParsingOfSomeStringsThroughPatterns() parses strings into dates through different formats.
showSomeDST() shows DST of London, New York and Berlin in march 2020.
showHourDifferenceBetweenLondonAndNewYorkVariesDueToDST() shows how time difference varies between New York and London due to DST not being applied at the same moment.
showSomeZonedDateTimeAndTimezoneClassesBehaviourDependingOnSystemTimezone() shows that a ZonedDateTime instance behaviour depends of the execution environment (the operating system/jvm configuration) by default.
showSomeZonedDateTimeAndTimezoneClassesBehaviourNotDependingOnSystemTimezone() shows how to have a ZonedDateTime behaving regardless of the system configuration.
showZonedDateTimeDoesnotHandleLeapSecond() shows ZonedDateTime don't handle leap seconds.
showHowToAddressAnHourThatHappensTwiceDuringTheSameDayWhenTheClockGoesBackward() shows how a developer can set a ZonedDateTime to both times referred by the same hour if that hour happens twice in the same day (DST clock backward). It is done through elapsed milliseconds.