time sources : Java Glossary

time sources
In our technological world there are many ways you can get the current time and date. Here is an eclectic list of time sources:
  1. From GPS satellites. GPS (Global Positioning System) provides a most excellent time source since it naturally compensates for propagation delay and is immune to network congestion and weather.
  2. setclock icon  SetClock is a Java Applet you can run on your PC (Personal Computer). It will get the accurate time from an atomic clock on the web provided by pool.ntp.org.
  3. From an atomic clock timeserver on the web using NTP NTP (Network Time Protocol). Timeservers come is various grades of accuracy. You are not supposed to pester the very accurate ones. They are for the secondary servers.
    NTP Time Servers
    Where Server IP (Internet Protocol) Can Use
    Without
    Notification
    AMntp.adc.am91.103.24.10
    AOao.pool.ntp.org196.216.249.2
    ARar.pool.ntp.org200.11.116.1
    ARtick.nap.com.ar200.10.140.1
    ARtock.nap.com.ar200.10.140.1
    ATat.pool.ntp.org193.170.62.252
    AUau.pool.ntp.org192.189.54.17
    AUntp.sjkwi.com.au203.206.185.142
    AUntp.tourism.wa.gov.au203.161.12.165
    AUntp1.tpg.com.au203.12.160.2
    AUntp2.tpg.com.au203.26.24.6
    Africaafrica.pool.ntp.org196.43.1.9
    Asiaasia.pool.ntp.org78.111.50.1
    BAba.pool.ntp.org195.222.33.219
    BDbd.pool.ntp.org114.130.13.6
    BEbe.pool.ntp.org193.104.37.238
    BEntp1.belbone.be195.13.23.5
    BEntp2.belbone.be195.13.1.153
    BGbg.pool.ntp.org78.128.1.18
    BRa.ntp.br200.160.0.8
    BRb.ntp.br200.189.40.8
    BRbr.pool.ntp.org200.189.40.8
    BRc.ntp.br200.192.232.8
    BRntp.pads.ufrj.br146.164.48.1
    BRntp.pop-pr.rnp.br200.19.74.21
    BRntp1.pucpr.br200.192.112.2
    BSbs.pool.ntp.org208.87.33.150
    BYby.pool.ntp.org82.209.240.241
    CAca.pool.ntp.org199.182.221.110
    CAntp1.cmc.ec.gc.ca199.212.17.34
    CAntp1.linuxhosted.ca72.20.40.62
    CAntp2.cmc.ec.gc.ca199.212.17.35
    CAntp2.linuxhosted.ca72.20.40.62
    CAntp3.linuxhosted.ca72.20.40.62
    CAtime.chu.nrc.ca209.87.233.53
    CAtime.nrc.ca132.246.11.229
    CA SK Reginatimelord.uregina.ca142.3.100.15
    CHb.ntp.madduck.net130.60.75.52
    CHc.ntp.madduck.net77.109.139.83
    CHch.pool.ntp.org81.94.123.16
    CHclock.tix.ch192.33.96.102
    CHntp.favey.ch195.34.89.227
    CHntp.metas.ch162.23.41.34
    CHntp11.metas.ch162.23.41.55
    CHntp12.metas.ch162.23.41.56
    CHtack.meteonews.ch78.46.52.71
    CHtick.meteonews.ch91.195.238.4
    CLcl.pool.ntp.org200.1.19.17
    CNcn.pool.ntp.org202.112.31.197
    CNhshh.org218.75.4.130
    CNt1.hshh.org218.75.4.130
    CNt2.hshh.org218.75.4.130
    CNt3.hshh.org61.153.197.226
    CRcr.pool.ntp.org200.59.16.3
    CZcz.pool.ntp.org212.96.160.147
    CZntp.cgi.cz81.0.239.181
    CZntp.globe.cz81.95.103.173
    CZntp.ujf.cas.cz147.231.100.5
    DEa.ntp.madduck.net188.174.253.163
    DEde.pool.ntp.org85.214.108.169
    DEgwyn.kn-bremen.de148.251.8.79
    DEhera.limescope.net188.40.128.210
    DElocalh0rst.de5.9.44.83
    DEntp.dianacht.de77.37.6.59
    DEntp.rueckgr.at5.9.110.236
    DEntp1.madavi.de62.8.239.62
    DEntp1.theremailer.net85.10.240.253
    DEntp2.hauke-lampe.de85.10.240.255
    DEntp2.madavi.de81.169.231.35
    DEstratum2-3.NTP.TechFak.Uni-Bielefeld.de129.70.132.32
    DEstratum2-3.NTP.TechFak.Uni-Bielefeld.de129.70.132.32
    DEstratum2-4.NTP.TechFak.Uni-Bielefeld.de129.70.132.33
    DEtime.edv-froehlich.de62.113.243.206
    DEtime2.one4vision.de212.82.32.26
    DEzeus.limescope.net188.40.85.143
    DKdk.pool.ntp.org46.30.126.195
    DKntp.dvconsulting.dk195.234.155.123
    DKntp.gal.dk195.234.155.124
    DKntp2.vlh.dk90.185.140.30
    EEee.pool.ntp.org212.7.1.131
    ESes.pool.ntp.org46.16.60.129
    EShora.oxixares.com5.135.139.67
    Europeeurope.pool.ntp.org194.50.97.12
    FIfi.pool.ntp.org194.100.2.198
    FIntp.lekksi.com81.22.251.67
    FItick.keso.fi82.197.0.130
    FItock.keso.fi82.197.0.130
    FRfr.pool.ntp.org37.187.7.160
    FRntp.crifo.org195.154.243.19
    FRntp.demongeot.biz212.83.158.83
    FRntp.home-dn.net88.191.135.237
    FRntp.obspm.fr145.238.203.10
    FRntp.via.ecp.fr138.195.130.62
    FR Lyonntp.univ-lyon1.fr134.214.100.6
    GRgr.pool.ntp.org193.239.214.226
    GRntp.mfa.gr195.167.30.249
    HKhk.pool.ntp.org202.131.74.126
    HRhr.pool.ntp.org161.53.131.232
    HRos.ntp.carnet.hr161.53.30.80
    HRri.ntp.carnet.hr161.53.30.170
    HRst.ntp.carnet.hr161.53.30.50
    HRzg1.ntp.carnet.hr161.53.123.5
    HRzg2.ntp.carnet.hr161.53.160.5
    HUhu.pool.ntp.org195.228.75.149
    HUntp.mandrivalinux.hu213.157.100.100
    HUtime.kfki.hu148.6.0.1
    IDid.pool.ntp.org202.146.247.134
    IEie.pool.ntp.org85.91.1.164
    IEntp.maths.tcd.ie134.226.81.3
    IE Dublinsalmon.maths.tcd.ie134.226.81.11
    ILil.pool.ntp.org212.199.182.150
    INin.pool.ntp.org123.108.225.6
    IRir.pool.ntp.org94.74.128.6
    ITntp.prato.linux.it62.48.53.90
    JPjp.pool.ntp.org116.58.172.182
    KRcse.inha.ac.kr165.246.43.176
    KRkr.pool.ntp.org211.233.78.116
    LKlk.pool.ntp.org220.247.242.85
    LTlt.pool.ntp.org212.59.0.2
    LUlu.pool.ntp.org80.92.86.19
    LVlv.pool.ntp.org85.254.217.235
    MDmd.pool.ntp.org178.168.120.183
    MDntp.fedoramd.org178.168.120.183
    MDntp2.idsi.md193.226.65.2
    MGmg.pool.ntp.org41.204.120.137
    MKmk.pool.ntp.org195.26.136.200
    MXmx.pool.ntp.org132.248.30.3
    MYmy.pool.ntp.org202.190.183.188
    NCnc.pool.ntp.org202.22.158.30
    NLnl.pool.ntp.org213.239.154.12
    NLntp.edge.tillo.ch62.192.15.212
    NLntp.minian.org83.96.227.85
    NLntp.wsrs.net5.200.6.34
    NOfartein.ifi.uio.no129.240.64.3
    NOno.pool.ntp.org85.89.3.25
    NOntp-public.uit.no129.242.4.241
    NZntp.iprolink.co.nz203.152.100.32
    NZntp.massey.ac.nz130.123.2.98
    NZntp.public.otago.ac.nz139.80.64.114
    NZnz.pool.ntp.org202.89.49.65
    NZtk1.ihug.co.nz203.109.135.194
    NZtk2.ihug.co.nz203.109.135.194
    NZtk3.ihug.co.nz203.109.129.1
    North America0.north-america.pool.ntp.org216.158.93.130
    North America1.north-america.pool.ntp.org198.211.124.130
    North America2.north-america.pool.ntp.org169.229.70.183
    North America3.north-america.pool.ntp.org69.167.160.102
    OMom.pool.ntp.org85.154.240.78
    Oceaniaoceania.pool.ntp.org203.26.72.7
    PAntp1.linocomm.net69.64.72.238
    PApa.pool.ntp.org64.116.170.5
    PKpk.pool.ntp.org203.82.48.83
    PLntp2.net.icm.edu.pl213.135.59.38
    PLntp2.radioalfa.pl89.171.11.30
    PLpl.pool.ntp.org194.177.4.2
    PTntp04.oal.ul.pt194.117.9.136
    PTpt.pool.ntp.org193.136.164.1
    ROntp1.dooh.ro89.36.18.21
    ROro.pool.ntp.org91.207.120.6
    RSrs.pool.ntp.org195.178.58.245
    RUntp.letinet.ru95.140.94.2
    RUntp.psn.ru194.149.67.129
    RUntp1.kangran.su93.185.187.110
    RUntp2.kangran.su89.221.207.113
    RUru.pool.ntp.org85.21.78.8
    RUticktock.net.ru80.93.53.29
    SEntp.systemtid.se213.65.33.110
    SEse.pool.ntp.org94.254.34.60
    SEtime.flygplats.net213.114.141.91
    SGsg.pool.ntp.org103.4.109.106
    SIntp1.arnes.si193.2.1.117
    SIntp2.arnes.si193.2.1.92
    SIsi.pool.ntp.org46.54.224.12
    SKsk.pool.ntp.org91.212.112.71
    SVsv.pool.ntp.org168.243.227.194
    South Americasouth-america.pool.ntp.org200.1.19.16
    South Australiantp.adelaide.edu.au129.127.40.3
    THth.pool.ntp.org203.158.118.2
    TRntp1.sibernet.com.tr95.9.114.16
    TRntp1.sibernet.com.tr95.9.114.16
    TRtr.pool.ntp.org194.27.222.5
    TWtw.pool.ntp.org61.219.119.37
    TZtz.pool.ntp.org41.222.88.32
    UAntp.vc.ukrtel.net213.179.228.16
    UAua.pool.ntp.org195.140.171.70
    UKextntp0.inf.ed.ac.uk129.215.160.240
    UKextntp1.inf.ed.ac.uk129.215.42.240
    UKntp.cis.strath.ac.uk130.159.196.117
    UKntp.exnet.com79.135.97.79
    UKntp.markyate.net84.45.170.220
    UKntp.pinklemon.net109.74.206.120
    UKntp1.uk.uu.net158.43.128.66
    UKtick.myodn.ch109.74.202.157
    UKuk.pool.ntp.org87.124.126.49
    UK Manchesterntp2a.mcc.ac.uk130.88.202.49
    UK Manchesterntp2b.mcc.ac.uk130.88.200.4
    UK Manchesterntp2c.mcc.ac.uk130.88.200.6
    UK Manchesterntp2d.mcc.ac.uk130.88.212.143
    UK Scotland Glasgowntp.cs.strath.ac.uk130.159.196.118
    USac-ntp0.net.cmu.edu128.2.1.20
    USac-ntp1.net.cmu.edu128.2.1.21
    USac-ntp2.net.cmu.edu128.2.1.22
    USmorose.quex.org206.222.28.90
    USntp.myfloridacity.us71.40.128.146
    USntp.rfnj.org74.63.215.214
    USntp1.chrisjohnston.org50.56.172.94
    USntp1.sjbcom.com65.216.242.42
    USntp1.stsn.net72.254.0.254
    USntp2.chrisjohnston.org50.56.172.94
    USntp3.stsn.net72.255.0.254
    USntp5.tamu.edu128.194.254.9
    USntppub.tamu.edu128.194.254.9
    USsaman-gh.co.uk146.185.168.168
    USthecraag.com96.238.93.48
    USus.pool.ntp.org216.66.0.142
    US AZdecimal.lib.ci.phoenix.az.us148.167.132.201
    US AZdewey.lib.ci.phoenix.az.us148.167.132.200
    US AZntp3.linocomm.net89.188.26.129
    US CAclock.develooper.com207.171.7.152
    US CAntp.drydog.com216.218.196.162
    US CAntp.nblug.org208.201.242.2
    US CAntp.ucsd.edu132.239.1.6
    US CAntp1.sf-bay.org173.228.26.157
    US CAreva.ziaspace.com206.221.211.41
    US COntp1.linuxmedialabs.com96.47.0.50
    US DE Newarklouie.udel.edu128.4.31.12
    US GArolex.usg.edu198.72.72.10
    US ILntp.mya.org75.150.206.145
    US ILstratum2.ord2.publicntp.net50.31.2.213
    US IL Urbana-Champaignntp-0.cso.uiuc.edu130.126.24.53
    US IL Urbana-Champaignntp-1.cso.uiuc.edu130.126.24.24
    US IL Urbana-Champaignntp-2.cso.uiuc.edu130.126.24.44
    US KSntp1.kansas.net64.6.144.6
    US KSntp2.kansas.net158.247.20.1
    US MAtimelord.w1nr.net173.255.227.205
    US MNns.nts.umn.edu128.101.101.101
    US MNnss.nts.umn.edu134.84.84.84
    US MNntp.skoglundtech.com173.14.5.42
    US MNntp157.sntp.us63.228.0.157
    US MOtime-ext.missouri.edu128.206.12.130
    US MTchronos1.umt.edu192.73.48.1
    US MTchronos2.umt.edu192.73.48.2
    US MTchronos3.umt.edu192.73.48.6
    US NCclock1.unc.edu152.2.21.1
    US NJtick.jrc.us208.90.144.52
    US NJtock.jrc.us208.90.144.53
    US NVcuckoo.nevada.edu131.216.1.101
    US NVtick.cs.unlv.edu131.216.22.24
    US NV Las Vegastock.cs.unlv.edu131.216.22.26
    US NYalice.ziaspace.com71.165.77.155
    US NYandromeda.ziaspace.com71.165.77.155
    US NYntp.pbx.org66.250.45.2
    US NYntp0.cornell.edu132.236.56.250
    US NYsundial.columbia.edu128.59.59.177
    US NY New Yorkntp.ctr.columbia.edu128.59.64.59
    US NY New Yorktimex.cs.columbia.edu128.59.16.20
    US PAfuzz.psc.edu128.182.58.100
    US PA University Parkclock.psu.edu128.118.25.3
    US TXchrono.cis.sac.accd.edu209.184.112.197
    US TXntp.bytestacker.com50.16.231.185
    US TXntp.fwwds.com107.20.168.69
    US TXntp.jentfoo.com173.203.211.73
    US TXntp.tmc.edu128.249.1.10
    US TXntp1.jtsage.com72.14.183.239
    US TXsundial.cis.sac.accd.edu209.184.112.198
    US TXtick.jpunix.net188.226.158.42
    US TXtick.mattnordhoff.com67.18.187.111
    US TXticker.cis.sac.accd.edu209.184.112.199
    US TXtime.xenscale.com72.14.188.195
    US VAntp-1.vt.edu198.82.1.201
    US VAntp-2.vt.edu198.82.1.202
    US VAntp-3.vt.edu198.82.1.203
    US VAntp-4.vt.edu198.82.1.204
    US VA Blacksburgvtserf.cc.vt.edu198.82.162.213
    US WAtick.mtnlion.com204.13.164.164
    US WIntp1.netwrx1.com108.76.168.145
    US WIntp3.netwrx1.com108.76.168.147
    US WIntp3.sf-bay.org206.55.70.42
    US WI Madisonntp1.cs.wisc.edu128.105.39.11
    US WI Madisonntp2.cs.wisc.edu128.105.38.11
    US WI Madisonntp3.cs.wisc.edu128.105.37.11
    VEve.pool.ntp.org190.202.98.221
    VNvn.pool.ntp.org113.161.84.122
    YUyu.pool.ntp.org212.200.82.130
    ZAza.pool.ntp.org197.84.150.123
    worldwidepool.ntp.org5.9.110.236
    Last revised/verified: 2010-03-15
  4. java.lang.System.currentTimeMillis () will give you the time in milliseconds since 1970 Jan 1 0:00 GMT (Greenwich Mean Time). This is your best bet for computing elapsed times. Freshly minted java.util.Date objects contain the current GMT date/time stamp as do freshly minted java.util. GregorianCalendar objects.
  5. Time.gov is a government website that will give you local time.
  6. XP/W2003/Vista/W2008/W7-32/W7-64/W8-32/W8-64 will consult a Microsoft web clock if you issue the command w32tm.exe /resync or right click the time display in the bottom right and select adjust date and time ⇒ Internet time. If time.windows.com time source is not reliable, (the usual case) you can configure the timeserver to a different one, perhaps from pool.ntp.org, e.g. us.pool.ntp.org, 0.ca.pool.ntp.orgw32tm.exe will only work after the W32Time service is started in the Windows task manager.
  7. pool.ntp.org maintains a set of servers all over the world. You can find one just by prefixing your 2-letter country code e.g ch.pool.ntp.org for Switzerland or 0.ca.pool.ntp.org for Canada or us.pool.ntp.org for the USA. The W32Time service must be running for W32tm.exe to work. You can start it from the command line with sc.exe start W32Time.
  8. atomic wall clock From the NIST (National Institute of Standards and Technology) WWVB radio signal broadcast from Fort Collins, Colorado. This is how high tech wall clocks and wrist watches maintain perfect time and know when to flip back and forth to daylight savings. They are called analog atomic clocks and digital atomic clocks, though there is nothing radioactive in them. They are merely radio-synchronised from a government atomic clock.
    radio-synched clocks for more details and information on where to buy them
  9. From a signal PBS embeds in its TV broadcasts. This is how VCRs (Videocassette Recorders) can get the time automatically.
  10. From the CBC (Canadian Broadcasting Corporation) radio time signal each day at 10 AM on the FM broadcast stations.
  11. From a signal broadcast on the AC (Alternating Current) power, put here by the utility company.
  12. From your TV Station broadcast channel guide.

available on the web at:

http://mindprod.com/jgloss/timesources.html
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