thomascolomba / date-dateswithjodatime Goto Github PK

Handling some dates with library Joda-time.

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

I) Generalities
a)DateTime
A DateTime represents an exact point on the time-line, but limited to the precision of milliseconds. It calculates its fields with respect to a time zone.


b)DateTimeZone
A time zone.


Date string representations are based on ISO 8601 : https://en.wikipedia.org/wiki/ISO_8601

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 Date through a joda DateTime.
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.
showSomeJodaDateTimeAndTimezoneClassesBehaviourDependingOnSystemTimezone() shows that a joda DateTime instance behaviour depends of the execution environment (the operating system/jvm configuration) by default.
showSomeJodaDateTimeAndTimezoneClassesBehaviourNotDependingOnSystemTimezone() shows how to have a joda DateTime behaving regardless of the system configuration.
showJodaDateTimeDoesnotHandleLeapSecond() shows joda DateTime don't handle leap seconds.
showHowToAddressAnHourThatHappensTwiceDuringTheSameDayWhenTheClockGoesBackward() shows how a developer can set a joda DateTime 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.