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java time thisara s research space skip to content menu about me publications thisara s research space software architecture and technology java time there were many issues experienced by developers in prior versions of java 8 such as date and calendar classes were not immutable they were not thread safe lack of date time conversion methods unavailability of timezone translation methods in order to solve those practical issues some alternative libraries were popular among java developers such as joda time date4j apache commons dateutils project thirteen these alternatives were addressing the pitfalls in the language provided date and calendar nevertheless java language realize this is a handicap for the developers and they added a new package called java time with the revealing of java 8 to the general public there is a distinct separation between classes which are intentionally created for timezone conversions and general regional specific usage with date time or timestamp the classes could be classified as below and all the timezone specific and local date time classes within time package are independent and they inherit only from object class java lang object java time localdate java time localtime java time localdatetime java time offsetdatetime java time offsettime java time duration java time period java time instant java time zoneddatetime java time zoneid next let s elaborate some useful implementations of java time package classes localdate localdate with year month and date this defaults to iso 8601 date format which is yyyy mm dd localdate localdate localdate of 2021 03 20 print localdate localdate localdate 2021 03 20 localdate parse with date in string format localdate localdateparsed localdate parse 2021 03 20 print localdateparsed localdateparsed localdateparsed 2021 03 20 format localdate into custom pattern localdate localdate localdate of 2021 03 20 string localdateformatted localdate format datetimeformatter ofpattern yyyy mm dd print localdateformatted localdateformatted localdateformatted 2021 03 20 date after specific number of days there are multiple options available to get this with the same result localdate localdate localdate of 2021 03 20 localdate dateinnextweek localdate plus 7 chronounit days or localdate dateinnextweek localdate plus period ofdays 7 or localdate dateinnextweek localdate plusdays 7 print dateinnextweek dateinnextweek dateinnextweek 2021 03 27 difference between two dates localdate localdate localdate of 2021 03 20 localdate dateinnextweek localdate plusdays 7 int datedifference period between localdate dateinnextweek getdays or long datedifference chronounit days between localdate dateinnextweek print datedifference datedifference datedifference 7 date comparison localdate startdate localdate parse 2021 03 20 localdate enddate localdate parse 2021 04 20 boolean isbeforedate startdate isbefore enddate boolean isafterdate startdate isafter enddate print startdate startdate is before enddate enddate isbeforedate print startdate startdate is after enddate enddate isafterdate startdate 2021 03 20 is before enddate 2021 04 20 true startdate 2021 03 20 is after enddate 2021 04 20 false get specific dates localdate localdate localdate of 2021 03 20 localdate firstdayofmonth localdate with temporaladjusters firstdayofmonth localdate lastdayofmonth localdate with temporaladjusters lastdayofmonth print firstdayofmonth firstdayofmonth print lastdayofmonth lastdayofmonth firstdayofmonth 2021 03 01 lastdayofmonth 2021 03 31 localtime localtime with hour minute second and nano of the second localtime localtime localtime of 9 30 45 50 print localtime localtime localtime 09 30 45 000000050 localtime parse with time in string format localtime localtimeparsed localtime parse 09 30 print localtimeparsed localtimeparsed localtimeparsed 09 30 localtime format into custom pattern localtime localtime localtime of 9 30 45 50 string localtimeformatted localtime format datetimeformatter ofpattern hh mm ss print localtimeformatted localtimeformatted localtimeformatted 09 30 45 time after specific time period localtime localtime localtime of 9 30 45 50 localtime timeatnextinterval localtime plus duration ofseconds 30 or localtime timeatnextinterval localtime plus 30 chronounit seconds or localtime timeatnextinterval localtime plusseconds 30 print timeatnextinterval timeatnextinterval timeatnextinterval 09 31 15 000000050 difference between time instants localtime localtime localtime of 9 30 45 50 localtime timeatnextinterval localtime plus duration ofseconds 30 long intervaldiff chronounit seconds between localtime timeatnextinterval print intervaldiff intervaldiff intervaldiff 30 compare two time instances localtime starttime localtime parse 09 30 localtime endtime localtime parse 07 30 boolean isbefore starttime isbefore endtime boolean isafter starttime isafter endtime print starttime starttime is before endtime endtime isbefore print starttime starttime is after endtime endtime isafter starttime 09 30 is before endtime 07 30 false starttime 09 30 is after endtime 07 30 true localdatetime with year month date and time localdatetime localdatetime localdatetime of 2021 month march 27 9 30 print localdatetime localdatetime localdatetime 2021 03 27t09 30 parse from a formatted string localdatetime localdatetimeparsed localdatetime parse 2021 03 20t09 30 00 print localdatetimeparsed localdatetimeparsed localdatetimeparsed 2021 03 20t09 30 format into custom format localdatetime localdatetime localdatetime of 2021 month march 27 9 30 string localdatetimeformatted localdatetime format datetimeformatter ofpattern yyyy mm dd hh mm ss print localdatetimeformatted localdatetimeformatted localdatetimeformatted 2021 03 27 09 30 00 format into iso date localdatetime localdatetime localdatetime of 2021 month march 27 9 30 string localisodate localdatetime format datetimeformatter iso_date print localisodate localisodate localisodate 2021 03 27 format into local localdatetime localdatetime localdatetime of 2021 month march 27 9 30 string ukdatetimeformat localdatetime format datetimeformatter oflocalizeddatetime formatstyle medium withlocale locale uk print ukdatetimeformat ukdatetimeformat ukdatetimeformat 27 mar 2021 09 30 00 get specific date time localdatetime localdatetime localdatetime of 2021 month march 27 9 30 localdatetime dateinnextyear localdatetime plus 1 chronounit years dayofweek dayofweek dateinnextyear getdayofweek print dateinnextyear dateinnextyear dayofweek dayofweek dateinnextyear 2022 03 27t09 30 dayofweek sunday zoneddatetime this class does not have any hierarchical relationship with localdatetime and dedicated for date time representation with specific timezone information get current zone timestamp zoneddatetime zoneddatetimenow zoneddatetime now print zoneddatetimenow zoneddatetimenow zoneddatetimenow 2021 04 08t19 42 14 233656 05 30 asia colombo get different zone timestamp zoneddatetime zoneddatetimedenver zoneddatetime ofinstant instant now zoneid of america denver or zoneddatetime zoneddatetimedenver zoneddatetime now zoneid of america denver print zoneddatetimedenver zoneddatetimedenver zoneddatetimedenver 2021 04 08t08 12 14 233751 06 00 america denver localdatetime to different zone localdatetime localdatetime localdatetime now zoneid zoneid zoneid of europe paris zoneddatetime zoneddatetime zoneddatetime of localdatetime zoneid print zoneddatetime zoneddatetime zoneddatetime 2021 04 08t20 28 16 306180 02 00 europe paris compare different timezones localdatetime localdatetime localdatetime of 2021 month march 27 9 30 zoneid zoneid zoneid of europe paris zoneddatetime zoneddatetime zoneddatetime of localdatetime zoneid zoneddatetime zoneddatetimenow zoneddatetime now boolean isbeforetime zoneddatetime isbefore zoneddatetimenow print zoneddatetime zoneddatetime is before zoneddatetimenow zoneddatetimenow isbeforetime zoneddatetime 2021 03 27t09 30 01 00 europe paris is before zoneddatetimenow 2021 04 08t19 42 14 233656 05 30 asia colombo true get all supported timezones set string zoneids zoneid getavailablezoneids for string zone zoneids print zone zone zone america virgin zone america pangnirtung zone pacific noumea zone america argentina san_juan zone australia darwin sample of time zone list output and there will more getting printed when you execute the above code offsetdatetime there are few basic similarities and differences between offsetdatetime and zoneddatetime as listed below both captures date time to the precision of nano seconds zoneddatetime is fully aware of dst adjustments however in offsetdatetime you will need to set the offset manually zoneddatetime controls the offsets by itself and not able to adjust intentionally act as a detailed user object since the zonedatetime contains all date time related data including timezone and seconds up to the precision of nano seconds although offsetdatetime capture date time without the timezone information but the offset from utc which is also known as the gmt offsetdatetime is ideal as a data store representation of date time since it is more query friendly define date with an offset zoneoffset offset zoneoffset of 07 00 offsetdatetime offsetdatetime offsetdatetime of localdatetime of 2021 month march 27 9 30 offset print offsetdatetime offsetdatetime offsetdatetime 2021 03 27t09 30 07 00 get current date time as instant this will return the current utc time instant nowinstant instant now print nowinstant nowinstant nowinstant 2021 04 08t15 01 51 119492z as localdatetime this will return current date time without any timezone information localdatetime localdatetimenow localdatetime now print localdatetimenow localdatetimenow localdatetimenow 2021 04 08t20 32 13 227212 as zoneddatetime this will return the date time with full information including the timezone zoneddatetime zoneddatetimenow zoneddatetime now print zoneddatetimenow zoneddatetimenow zoneddatetimenow 2021 04 08t20 32 31 689008 05 30 asia colombo epoch unix time this is the time elapsed form 1 1 1970 which is 1970 01 01t00 00 00z in iso 8601 standard this is also known as the unix 0 time zoneid zone zoneid of europe berlin zoneddatetime zoneddatetime zoneddatetime now zone long epochseconds zoneddatetime toepochsecond print epochseconds epochseconds epochseconds 1617894177 legacy date and calendar to java8 time calendar calendar calendar getinstance calendar set calendar month 02 calendar set calendar date 20 calendar set calendar year 2021 date date calendar gettime localdatetime colombotime localdatetime ofinstant date toinstant zoneid of asia colombo localdatetime paristime localdatetime ofinstant date toinstant zoneid of europe paris print colombotime colombotime tostring print paristime paristime tostring colombotime 2021 03 20t20 33 37 711 paristime 2021 03 20t16 03 37 711 print message method implementation public static void print string text system out println text demo https bitbucket org thisara_udaya java time practical usage of java tim e https www youtube com watch v poo _v339my references 1 https docs oracle com javase 8 docs api java time package tree html 2 https docs oracle com javase tutorial datetime iso overview html share this share on x opens in new window x share on facebook opens in new window facebook more share on linkedin opens in new window linkedin share on tumblr opens in new window tumblr share on whatsapp opens in new window whatsapp like loading april 9 2021 june 13 2024 thisara java date java time java timezone conversions java8 time java8 timezone local localdatetime time time conversions timestamp timezone zoneddatetime leave a comment cancel reply δ post navigation previous post setting up two git accounts on local pc next post difference between shallow vs deep copy of objects in java recent posts distributed software architecture styles react ui component libraries difference between shallow vs deep copy of objects in java 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