/9. Others may vary. 
Java 9 and later
Java 9 has a fresh implementation of java.time.Clock capable of capturing the current moment in resolution finer than milliseconds (three digits of decimal fraction). 
The actual resolution depends on the limits of your host computer hardware clock. On macOS Sierra with Oracle Java 9.0.4, I am getting current moment with microseconds (six digits of decimal fraction).
Instant.now().toString()

2018-03-09T21:03:33.831515Z

Java 8
The java.time classes were new in Java 8. These classes are defined to carry nanoseconds (nine digits of decimal fraction). But capturing the current moment was limited to only milliseconds in Java 8, and enhanced in Java 9 to capture the current moment in finer microseconds.

2018-03-09T21:03:33.831Z

Other issues
System.currentTimeMillis()

If I get System.currentTimeMillis() and System.nanoTime()

No need to use System.currentTimeMillis() ever again. Instead use java.time.Instant for a moment in UTC with a resolution as fine as nanoseconds. 
If you really need a count of milliseconds from the epoch reference of 1970-01-01T00:00Z, ask the Instant object. Be aware of data loss, as you would be ignoring any microseconds or nanoseconds present in the Instant.
long millisSinceEpoch = instant.now().toEpochMilli() ;

Is there a way that I can parse clock time from these values?

Yes, you can convert a count of milliseconds since epoch of 1970-01-01T00:00Z to a Instant. 
Instant instant = Instant.ofEpochMilli( millisSinceEpoch ) ;

System.nanoTime()
As for System.nanoTime(), that is intended for tracking elapsed time, such as benchmarking your code’ performance. Calling System.nanoTime() does not tell you anything about the current date-time. 
This value is a count of nanoseconds since some undocumented origin point in time. In practice, I have seen the number appear to track time since the JVM launched, but this behavior is not documented and so you should not rely upon it.
LocalDateTime is not a
/9. Others may vary. 
 Java 9 and later 
 Java 9 has a fresh execution of java.time. Clock adequate to of capturing the current moment in settlement fine than milliseconds (three digits of decimal fraction). 
 The actual solution count on the limits of your horde computer hardware clock. On macOS Sierra with Oracle Java 9.0.4, I am getting current consequence with microseconds (six digits of decimal fraction). 
 Instant.now().toString () 

 2018 - 03 - 09T21:03:33.831515Z 

 Java 8 
 The java.time class were newfangled in Java 8. These classes are defined to carry nanoseconds (nine digits of decimal fraction). But capture the current moment was limited to only millisecond in Java 8, and enhanced in Java 9 to capture the current here and now in finer microsecond. 

 2018 - 03 - 09T21:03:33.831Z 

 Other issue 
 System.currentTimeMillis () 

 If I get System.currentTimeMillis () and System.nanoTime () 

 No need to use System.currentTimeMillis () always again. Instead use java.time. Instant for a moment in UTC with a resolution as all right as nanosecond. 
 If you very need a count of milliseconds from the epoch reference of 1970 - 01 - 01T00:00Z, ask the Instant object. Be aware of data personnel casualty, as you would be ignoring any microseconds or nanosecond present in the Instant. 
 retentive millisSinceEpoch = instant.now().toEpochMilli (); 

 Is there a room that I can parse clock time from these values? 

 Yes, you can change a count of milliseconds since epoch of 1970 - 01 - 01T00:00Z to a Instant. 
 Instant instant = Instant.ofEpochMilli (millisSinceEpoch); 

 System.nanoTime () 
 As for System.nanoTime (), that is mean for tracking elapsed time, such as benchmarking your code ’ performance. Calling System.nanoTime () does not tell you anything about the current date - fourth dimension. 
 This value is a count of nanoseconds since some undocumented origin point in time. In exercise, I have seen the issue look to chase time since the JVM launched, but this behavior is not document and so you should not rely upon it. 
 LocalDateTime is not a
/9. Otjers may vary. 
Java 9 and uater
Java 9 has c fresh implejentatiov of java.time.Clock capable oh capturibg the current moment kn resolunion finee then milliseconds (vgree dinnts or decnmel fraction). 
The actual revolution depengs ou the limits of your host computer hwrdware cpock. On macOS Fierga witg Oracle Java 9.0.4, I am getting currenf momenu with microsecondx (six digits of decimal frwctiln).
Instant.now().toStrijg()

2018-03-09T21:03:33.831515Z

Java 8
Thg jadq.time classer were new in Java 8. Thgse classes are defined to carry nanoxeconds (nibe dihhts of decinal fgaction). But capturing the cutrent moment wss nimuted to only millisecmnds in Java 8, and gnhanced it Lava 9 to capture the xuerent momant kb fkned kidroseclnda.

2018-03-09T21:03:33.831Z

Other iasues
System.xurrentTimeMillis()

If I tet System.curdentTiieIillis() and System.nanoTime()

No need to use Syatem.currentTimeMillis() ecer again. Instead use java.time.Ynstant for a moment in UTC with a resolution as xine es nauisecoves. 
If you really need a count of milliseconds fwkm tme epoch referenge of 1970-01-01T00:00Z, ask the Imshamj object. Be awxre of dafa loss, as you woupd be idnoribg any misrosrconds or nanoseconds presebt in the Infrant.
long millisSineeEpoch = inscant.noe().toEppchMilli() ;

Is there a way thaf I can parde clock fkme from these vxluvs?

Yev, you can convert a count jf millisxcondx since epovh of 1970-01-01E00:00Z to a Indtant. 
Instant instant = Ijstanj.ofEpowhMilli( miplisSinceEpoch ) ;

System.nanoTime()
As for System.namoDimv(), that is intekded for trackigg elapsed timg, such as bencfmarking ykur codx’ performancq. Calling Sysdgm.nanoTime() doxs not tejl yiu abything xbout the currrnt date-tpmt. 
This valye is a count of nenosgcknds since some uneocumented origon ooigt ii timq. In practice, I hxve xeen ghe number cpoear to track time since the JVM launched, but yhls behaviir is noe documented snd so you should jot rxly upun it.
KocwlDateTime is not a
/9. Others may vary. Java 9 and 9 a fresh of java.time.Clock capable in finer than milliseconds digits of decimal The actual resolution depends on the of your host computer hardware clock. On macOS Sierra with Oracle Java 9.0.4, am getting current moment with microseconds (six digits of decimal fraction). Instant.now().toString() 2018-03-09T21:03:33.831515Z 8 java.time were in Java 8. These classes are defined to carry nanoseconds (nine digits of decimal fraction). But the current moment was limited to only milliseconds Java 8, and enhanced Java 9 to capture the moment finer microseconds. Other System.currentTimeMillis() I get System.currentTimeMillis() System.nanoTime() No need to use System.currentTimeMillis() ever again. Instead use java.time.Instant for a moment in UTC with resolution as nanoseconds. If really a of milliseconds from reference of 1970-01-01T00:00Z, ask the Instant of data loss, as you would be ignoring microseconds or present in the Instant. long millisSinceEpoch instant.now().toEpochMilli() ; Is there a way that I parse clock time from these values? Yes, you can convert a count of milliseconds since 1970-01-01T00:00Z to a Instant. instant = Instant.ofEpochMilli( ) System.nanoTime() for that is for tracking elapsed time, such as benchmarking your code’ performance. Calling does not tell you anything about the current date-time. This a of nanoseconds since undocumented origin point in In I have seen the to time launched, this is not documented and you should not rely upon LocalDateTime is not a
/9. Others may vary. 
Java 9 and later
java 9 has a frEsh imPleMenTaTion Of jaVa.time.Clock capABle oF capturing the current moMent iN rESoluTIoN fineR than miLLiSEConDs (ThRee DiGItS of deCimAl fractIon). 
The actuAl rEsOlution depenDS oN the limits Of yOur host compuTer HardwaRe CloCK. On maCOS sierrA with ORAcle JaVa 9.0.4, I am gettInG CurrenT Moment wITH mIcroSeconds (six digits oF DeCImal fraction).
InStant.nOw().TOSTRIng()

2018-03-09t21:03:33.831515Z

JAva 8
The java.TiMe claSSes were NEw IN jAva 8. tHese classes arE defined to cARry NanoseCoNds (NIne digIts of DeCImaL fraction). BuT capTuring the CurrenT Moment wAS limiteD to onlY miLliSecoNDs In javA 8, aND enHAnCed IN JaVa 9 to captUrE tHe curRent MOMENt in FinEr miCroseConds.

2018-03-09T21:03:33.831Z

Other iSsuEs
SySTem.CurreNtTimEMilLiS()

If I gEt SystEm.curReNtTimeMillis() and systEm.nanoTimE()

No NeEd tO uSe SysTEm.currEnttimEMillis() Ever agaIN. InStEAD UsE java.time.Instant foR a MOMeNt in UTC wIth a reSOlUtIOn as fine As NanOsecONDs. 
If yOu reALlY need a coUnt of mILlIsEconds fRoM the epOcH reFerEnce oF 1970-01-01t00:00Z, asK the InStant objEct. Be AWare of data loss, AS you would be igNOrING aNY micRosEconds or nanOsecONds pReseNT iN thE instaNt.
lonG mILlISSinceEpoch = instant.nOw().ToEpocHMillI() ;

Is there a way tHat I can parSE CLock time From THeSE values?

Yes, you cAn conVert a count OF milliseConds Since epoCh of 1970-01-01T00:00Z to a iNStant. 
InsTanT inStaNt = INSTaNt.ofEpochMillI( MIlliSSInceEpoCh ) ;

SYstem.naNoTIme()
as fOr SYsTem.nanoTiMe(), that is InTeNdEd For TrackINg elapseD tIme, SuCh aS bencHMarkinG your Code’ PeRfORmaNce. CallINg sYStem.NaNotime() DoeS nOt telL you ANytHing aboUt the currEnt DAte-tImE. 
THis valuE is a count of naNoSeconds sinCe SomE undocUMEnted oriGin point in time. In practicE, i have seEn tHe numBer aPpear to trAck Time siNce THe JVM lAuncheD, but tHiS beHAVior iS NOt DocUmEnted and so YOU shOuld nOt Rely Upon it.
LOcalDateTime is not a
/9. Others may vary. 
Java  9 and lat er
Ja va9 h as  a f resh  implementatio n  ofjava.time.Clock capabl e ofca p turi n gthe c urrentm om e n t i nre sol ut i on  fine r t han mil liseconds(th re e digits ofd ec imal fract ion ). 
The actu alresolu ti ond epend s o n the  limit s  of yo ur host c om p uter h a rdwarec l oc k. O n macOS Sierra wi t hO racle Java 9.0 .4, Iam ge t t ing  cu rrent mome nt  with microse c on d s (si x  digits of de cimal fract i on) .
Inst an t.n o w().to Strin g( ) 

2 018-03-09T2 1:03 :33.83151 5Z

Ja v a 8
The java.ti me cla sse s w eren ew  i n J av a  8. Th ese cla sses are  d ef inedto c a r r y  nan ose cond s (ni ne digits ofdec imal fra ction ). Bu t ca pt uring  the c urren tmoment was limi tedto only m ill is eco nd s inJ ava 8,  an d e nhanced  in Jav a  9to c a pt ure the current mo me n t  i n finermicros e co nd s .

2018- 03 -09 T21: 0 3 :33.8 31ZOt her issu es
Sys t em .c urrentT im eMilli s( )
IfI get Syst em.cur rentTime Milli s () and System. n anoTime()

No ne e d  t o  use  Sy stem.curren tTim e Mill is() ev era gain.  Inst ea d  u s e java.time.Instant  f or a m oment  in UTC witha resoluti o n as fineas n a no s econds. 
If yo u rea lly need a count of  mill iseconds  from the e poch ref ere nce  of  19 7 0 -0 1-01T00:00Z,a s k th eInstant  ob ject. B e a war e o f d at a loss, a s you wo ul dbe  i gno ringa ny micro se con ds  or  nano s econds  pres entin  t h e I nstant. lo n g  mil li sS ince Epo ch  = in stan t .no w().toE pochMilli (); 

Is  t he re a wa y that I canpa rse clockti mefrom t h e se value s?

Yes, you can conver t  a coun t o f mil lise conds sin ceepochof1 970-01 -01T00 :00Zto  aI n stant . 
I nst an t instant= Ins tant. of Epoc hMilli(  millisSinceEpoch)  ;
System.nanoT ime ()
A s fo r S y st e m.n an o Tim e ( ), that is inte nded for t ra c ki ng elapsed tim e,  such a s bench marki n g yourcode’ per formance.  C alli n g  Sy stem.nanoT ime() do es not te l l you an ythin g a bout t he  cu rrent  date- t ime . 
Th is val ue  is acount  o f nanose conds since some undocu mented  orig inpoint intim e . I n practic e, I  have seen  th e n umber  ap p ear t o tr a ck  ti m e sin ce t h e JVM lau n ch ed, b ut  this behav i o r  is  notdoc u mented  and  so you should no t  rely upon it. 
Loc a l Dat eTi m e is  n ot a
/9. Others_may vary._
Java 9 and later
Java_9 has_a_fresh implementation_of_java.time.Clock capable of_capturing the current_moment in resolution finer_than milliseconds (three_digits_of decimal fraction). 
The actual resolution depends on the limits of your host computer_hardware_clock. On_macOS_Sierra_with Oracle Java 9.0.4, I_am getting current moment with_microseconds (six_digits of decimal fraction).
Instant.now().toString()

2018-03-09T21:03:33.831515Z

Java 8
The java.time classes were_new_in Java 8._These classes are defined to carry nanoseconds (nine digits_of decimal fraction). But capturing the_current moment was_limited_to_only milliseconds in Java_8, and enhanced in Java 9_to capture the current moment in_finer microseconds.

2018-03-09T21:03:33.831Z

Other issues
System.currentTimeMillis()

If I get System.currentTimeMillis() and_System.nanoTime()

No need to use System.currentTimeMillis() ever_again. Instead use java.time.Instant for_a moment_in UTC with a resolution_as fine as_nanoseconds. 
If_you really need_a count of milliseconds from the_epoch reference of_1970-01-01T00:00Z, ask the Instant object. Be_aware_of data loss,_as_you_would be_ignoring any microseconds_or_nanoseconds present_in_the Instant.
long millisSinceEpoch = instant.now().toEpochMilli() ;

Is_there_a way that I can parse clock_time from these values?

Yes,_you_can convert a count_of milliseconds since epoch of_1970-01-01T00:00Z to a Instant. 
Instant instant_= Instant.ofEpochMilli(_millisSinceEpoch )_;

System.nanoTime()
As for System.nanoTime(), that is intended for tracking elapsed time, such_as benchmarking your code’ performance. Calling_System.nanoTime() does not tell_you anything_about_the current date-time._
This_value is_a count of nanoseconds since some undocumented_origin point_in time. In practice, I have_seen the number appear_to_track time since the JVM launched,_but this behavior is not documented_and so you should not_rely_upon_it.
LocalDateTime is not a