time sources : Java Glossary

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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
    AM ntp.adc.am 91.103.24.10
    AO ao.pool.ntp.org 196.216.249.2
    AR ar.pool.ntp.org 200.11.116.1
    AR tick.nap.com.ar 200.10.140.1
    AR tock.nap.com.ar 200.10.140.1
    AT at.pool.ntp.org 193.170.62.252
    AU au.pool.ntp.org 192.189.54.17
    AU ntp.sjkwi.com.au 203.206.185.142
    AU ntp.tourism.wa.gov.au 203.161.12.165
    AU ntp1.tpg.com.au 203.12.160.2
    AU ntp2.tpg.com.au 203.26.24.6
    Africa africa.pool.ntp.org 196.43.1.9
    Asia asia.pool.ntp.org 78.111.50.1
    BA ba.pool.ntp.org 195.222.33.219
    BD bd.pool.ntp.org 114.130.13.6
    BE be.pool.ntp.org 193.104.37.238
    BE ntp1.belbone.be 195.13.23.5
    BE ntp2.belbone.be 195.13.1.153
    BG bg.pool.ntp.org 78.128.1.18
    BR a.ntp.br 200.160.0.8
    BR b.ntp.br 200.189.40.8
    BR br.pool.ntp.org 200.189.40.8
    BR c.ntp.br 200.192.232.8
    BR ntp.pads.ufrj.br 146.164.48.1
    BR ntp.pop-pr.rnp.br 200.19.74.21
    BR ntp1.pucpr.br 200.192.112.2
    BS bs.pool.ntp.org 208.87.33.150
    BY by.pool.ntp.org 82.209.240.241
    CA ca.pool.ntp.org 199.182.221.110
    CA ntp1.cmc.ec.gc.ca 199.212.17.34
    CA ntp1.linuxhosted.ca 72.20.40.62
    CA ntp2.cmc.ec.gc.ca 199.212.17.35
    CA ntp2.linuxhosted.ca 72.20.40.62
    CA ntp3.linuxhosted.ca 72.20.40.62
    CA time.chu.nrc.ca 209.87.233.53
    CA time.nrc.ca 132.246.11.229
    CA SK Regina timelord.uregina.ca 142.3.100.15
    CH b.ntp.madduck.net 130.60.75.52
    CH c.ntp.madduck.net 77.109.139.83
    CH ch.pool.ntp.org 81.94.123.16
    CH clock.tix.ch 192.33.96.102
    CH ntp.favey.ch 195.34.89.227
    CH ntp.metas.ch 162.23.41.34
    CH ntp11.metas.ch 162.23.41.55
    CH ntp12.metas.ch 162.23.41.56
    CH tack.meteonews.ch 78.46.52.71
    CH tick.meteonews.ch 91.195.238.4
    CL cl.pool.ntp.org 200.1.19.17
    CN cn.pool.ntp.org 202.112.31.197
    CN hshh.org 218.75.4.130
    CN t1.hshh.org 218.75.4.130
    CN t2.hshh.org 218.75.4.130
    CN t3.hshh.org 61.153.197.226
    CR cr.pool.ntp.org 200.59.16.3
    CZ cz.pool.ntp.org 212.96.160.147
    CZ ntp.cgi.cz 81.0.239.181
    CZ ntp.globe.cz 81.95.103.173
    CZ ntp.ujf.cas.cz 147.231.100.5
    DE a.ntp.madduck.net 188.174.253.163
    DE de.pool.ntp.org 85.214.108.169
    DE gwyn.kn-bremen.de 148.251.8.79
    DE hera.limescope.net 188.40.128.210
    DE localh0rst.de 5.9.44.83
    DE ntp.dianacht.de 77.37.6.59
    DE ntp.rueckgr.at 5.9.110.236
    DE ntp1.madavi.de 62.8.239.62
    DE ntp1.theremailer.net 85.10.240.253
    DE ntp2.hauke-lampe.de 85.10.240.255
    DE ntp2.madavi.de 81.169.231.35
    DE stratum2-3.NTP.TechFak.Uni-Bielefeld.de 129.70.132.32
    DE stratum2-3.NTP.TechFak.Uni-Bielefeld.de 129.70.132.32
    DE stratum2-4.NTP.TechFak.Uni-Bielefeld.de 129.70.132.33
    DE time.edv-froehlich.de 62.113.243.206
    DE time2.one4vision.de 212.82.32.26
    DE zeus.limescope.net 188.40.85.143
    DK dk.pool.ntp.org 46.30.126.195
    DK ntp.dvconsulting.dk 195.234.155.123
    DK ntp.gal.dk 195.234.155.124
    DK ntp2.vlh.dk 90.185.140.30
    EE ee.pool.ntp.org 212.7.1.131
    ES es.pool.ntp.org 46.16.60.129
    ES hora.oxixares.com 5.135.139.67
    Europe europe.pool.ntp.org 194.50.97.12
    FI fi.pool.ntp.org 194.100.2.198
    FI ntp.lekksi.com 81.22.251.67
    FI tick.keso.fi 82.197.0.130
    FI tock.keso.fi 82.197.0.130
    FR fr.pool.ntp.org 37.187.7.160
    FR ntp.crifo.org 195.154.243.19
    FR ntp.demongeot.biz 212.83.158.83
    FR ntp.home-dn.net 88.191.135.237
    FR ntp.obspm.fr 145.238.203.10
    FR ntp.via.ecp.fr 138.195.130.62
    FR Lyon ntp.univ-lyon1.fr 134.214.100.6
    GR gr.pool.ntp.org 193.239.214.226
    GR ntp.mfa.gr 195.167.30.249
    HK hk.pool.ntp.org 202.131.74.126
    HR hr.pool.ntp.org 161.53.131.232
    HR os.ntp.carnet.hr 161.53.30.80
    HR ri.ntp.carnet.hr 161.53.30.170
    HR st.ntp.carnet.hr 161.53.30.50
    HR zg1.ntp.carnet.hr 161.53.123.5
    HR zg2.ntp.carnet.hr 161.53.160.5
    HU hu.pool.ntp.org 195.228.75.149
    HU ntp.mandrivalinux.hu 213.157.100.100
    HU time.kfki.hu 148.6.0.1
    ID id.pool.ntp.org 202.146.247.134
    IE ie.pool.ntp.org 85.91.1.164
    IE ntp.maths.tcd.ie 134.226.81.3
    IE Dublin salmon.maths.tcd.ie 134.226.81.11
    IL il.pool.ntp.org 212.199.182.150
    IN in.pool.ntp.org 123.108.225.6
    IR ir.pool.ntp.org 94.74.128.6
    IT ntp.prato.linux.it 62.48.53.90
    JP jp.pool.ntp.org 116.58.172.182
    KR cse.inha.ac.kr 165.246.43.176
    KR kr.pool.ntp.org 211.233.78.116
    LK lk.pool.ntp.org 220.247.242.85
    LT lt.pool.ntp.org 212.59.0.2
    LU lu.pool.ntp.org 80.92.86.19
    LV lv.pool.ntp.org 85.254.217.235
    MD md.pool.ntp.org 178.168.120.183
    MD ntp.fedoramd.org 178.168.120.183
    MD ntp2.idsi.md 193.226.65.2
    MG mg.pool.ntp.org 41.204.120.137
    MK mk.pool.ntp.org 195.26.136.200
    MX mx.pool.ntp.org 132.248.30.3
    MY my.pool.ntp.org 202.190.183.188
    NC nc.pool.ntp.org 202.22.158.30
    NL nl.pool.ntp.org 213.239.154.12
    NL ntp.edge.tillo.ch 62.192.15.212
    NL ntp.minian.org 83.96.227.85
    NL ntp.wsrs.net 5.200.6.34
    NO fartein.ifi.uio.no 129.240.64.3
    NO no.pool.ntp.org 85.89.3.25
    NO ntp-public.uit.no 129.242.4.241
    NZ ntp.iprolink.co.nz 203.152.100.32
    NZ ntp.massey.ac.nz 130.123.2.98
    NZ ntp.public.otago.ac.nz 139.80.64.114
    NZ nz.pool.ntp.org 202.89.49.65
    NZ tk1.ihug.co.nz 203.109.135.194
    NZ tk2.ihug.co.nz 203.109.135.194
    NZ tk3.ihug.co.nz 203.109.129.1
    North America 0.north-america.pool.ntp.org 216.158.93.130
    North America 1.north-america.pool.ntp.org 198.211.124.130
    North America 2.north-america.pool.ntp.org 169.229.70.183
    North America 3.north-america.pool.ntp.org 69.167.160.102
    OM om.pool.ntp.org 85.154.240.78
    Oceania oceania.pool.ntp.org 203.26.72.7
    PA ntp1.linocomm.net 69.64.72.238
    PA pa.pool.ntp.org 64.116.170.5
    PK pk.pool.ntp.org 203.82.48.83
    PL ntp2.net.icm.edu.pl 213.135.59.38
    PL ntp2.radioalfa.pl 89.171.11.30
    PL pl.pool.ntp.org 194.177.4.2
    PT ntp04.oal.ul.pt 194.117.9.136
    PT pt.pool.ntp.org 193.136.164.1
    RO ntp1.dooh.ro 89.36.18.21
    RO ro.pool.ntp.org 91.207.120.6
    RS rs.pool.ntp.org 195.178.58.245
    RU ntp.letinet.ru 95.140.94.2
    RU ntp.psn.ru 194.149.67.129
    RU ntp1.kangran.su 93.185.187.110
    RU ntp2.kangran.su 89.221.207.113
    RU ru.pool.ntp.org 85.21.78.8
    RU ticktock.net.ru 80.93.53.29
    SE ntp.systemtid.se 213.65.33.110
    SE se.pool.ntp.org 94.254.34.60
    SE time.flygplats.net 213.114.141.91
    SG sg.pool.ntp.org 103.4.109.106
    SI ntp1.arnes.si 193.2.1.117
    SI ntp2.arnes.si 193.2.1.92
    SI si.pool.ntp.org 46.54.224.12
    SK sk.pool.ntp.org 91.212.112.71
    SV sv.pool.ntp.org 168.243.227.194
    South America south-america.pool.ntp.org 200.1.19.16
    South Australia ntp.adelaide.edu.au 129.127.40.3
    TH th.pool.ntp.org 203.158.118.2
    TR ntp1.sibernet.com.tr 95.9.114.16
    TR ntp1.sibernet.com.tr 95.9.114.16
    TR tr.pool.ntp.org 194.27.222.5
    TW tw.pool.ntp.org 61.219.119.37
    TZ tz.pool.ntp.org 41.222.88.32
    UA ntp.vc.ukrtel.net 213.179.228.16
    UA ua.pool.ntp.org 195.140.171.70
    UK extntp0.inf.ed.ac.uk 129.215.160.240
    UK extntp1.inf.ed.ac.uk 129.215.42.240
    UK ntp.cis.strath.ac.uk 130.159.196.117
    UK ntp.exnet.com 79.135.97.79
    UK ntp.markyate.net 84.45.170.220
    UK ntp.pinklemon.net 109.74.206.120
    UK ntp1.uk.uu.net 158.43.128.66
    UK tick.myodn.ch 109.74.202.157
    UK uk.pool.ntp.org 87.124.126.49
    UK Manchester ntp2a.mcc.ac.uk 130.88.202.49
    UK Manchester ntp2b.mcc.ac.uk 130.88.200.4
    UK Manchester ntp2c.mcc.ac.uk 130.88.200.6
    UK Manchester ntp2d.mcc.ac.uk 130.88.212.143
    UK Scotland Glasgow ntp.cs.strath.ac.uk 130.159.196.118
    US ac-ntp0.net.cmu.edu 128.2.1.20
    US ac-ntp1.net.cmu.edu 128.2.1.21
    US ac-ntp2.net.cmu.edu 128.2.1.22
    US morose.quex.org 206.222.28.90
    US ntp.myfloridacity.us 71.40.128.146
    US ntp.rfnj.org 74.63.215.214
    US ntp1.chrisjohnston.org 50.56.172.94
    US ntp1.sjbcom.com 65.216.242.42
    US ntp1.stsn.net 72.254.0.254
    US ntp2.chrisjohnston.org 50.56.172.94
    US ntp3.stsn.net 72.255.0.254
    US ntp5.tamu.edu 128.194.254.9
    US ntppub.tamu.edu 128.194.254.9
    US saman-gh.co.uk 146.185.168.168
    US thecraag.com 96.238.93.48
    US us.pool.ntp.org 216.66.0.142
    US AZ decimal.lib.ci.phoenix.az.us 148.167.132.201
    US AZ dewey.lib.ci.phoenix.az.us 148.167.132.200
    US AZ ntp3.linocomm.net 89.188.26.129
    US CA clock.develooper.com 207.171.7.152
    US CA ntp.drydog.com 216.218.196.162
    US CA ntp.nblug.org 208.201.242.2
    US CA ntp.ucsd.edu 132.239.1.6
    US CA ntp1.sf-bay.org 173.228.26.157
    US CA reva.ziaspace.com 206.221.211.41
    US CO ntp1.linuxmedialabs.com 96.47.0.50
    US DE Newark louie.udel.edu 128.4.31.12
    US GA rolex.usg.edu 198.72.72.10
    US IL ntp.mya.org 75.150.206.145
    US IL stratum2.ord2.publicntp.net 50.31.2.213
    US IL Urbana-Champaign ntp-0.cso.uiuc.edu 130.126.24.53
    US IL Urbana-Champaign ntp-1.cso.uiuc.edu 130.126.24.24
    US IL Urbana-Champaign ntp-2.cso.uiuc.edu 130.126.24.44
    US KS ntp1.kansas.net 64.6.144.6
    US KS ntp2.kansas.net 158.247.20.1
    US MA timelord.w1nr.net 173.255.227.205
    US MN ns.nts.umn.edu 128.101.101.101
    US MN nss.nts.umn.edu 134.84.84.84
    US MN ntp.skoglundtech.com 173.14.5.42
    US MN ntp157.sntp.us 63.228.0.157
    US MO time-ext.missouri.edu 128.206.12.130
    US MT chronos1.umt.edu 192.73.48.1
    US MT chronos2.umt.edu 192.73.48.2
    US MT chronos3.umt.edu 192.73.48.6
    US NC clock1.unc.edu 152.2.21.1
    US NJ tick.jrc.us 208.90.144.52
    US NJ tock.jrc.us 208.90.144.53
    US NV cuckoo.nevada.edu 131.216.1.101
    US NV tick.cs.unlv.edu 131.216.22.24
    US NV Las Vegas tock.cs.unlv.edu 131.216.22.26
    US NY alice.ziaspace.com 71.165.77.155
    US NY andromeda.ziaspace.com 71.165.77.155
    US NY ntp.pbx.org 66.250.45.2
    US NY ntp0.cornell.edu 132.236.56.250
    US NY sundial.columbia.edu 128.59.59.177
    US NY New York ntp.ctr.columbia.edu 128.59.64.59
    US NY New York timex.cs.columbia.edu 128.59.16.20
    US PA fuzz.psc.edu 128.182.58.100
    US PA University Park clock.psu.edu 128.118.25.3
    US TX chrono.cis.sac.accd.edu 209.184.112.197
    US TX ntp.bytestacker.com 50.16.231.185
    US TX ntp.fwwds.com 107.20.168.69
    US TX ntp.jentfoo.com 173.203.211.73
    US TX ntp.tmc.edu 128.249.1.10
    US TX ntp1.jtsage.com 72.14.183.239
    US TX sundial.cis.sac.accd.edu 209.184.112.198
    US TX tick.jpunix.net 188.226.158.42
    US TX tick.mattnordhoff.com 67.18.187.111
    US TX ticker.cis.sac.accd.edu 209.184.112.199
    US TX time.xenscale.com 72.14.188.195
    US VA ntp-1.vt.edu 198.82.1.201
    US VA ntp-2.vt.edu 198.82.1.202
    US VA ntp-3.vt.edu 198.82.1.203
    US VA ntp-4.vt.edu 198.82.1.204
    US VA Blacksburg vtserf.cc.vt.edu 198.82.162.213
    US WA tick.mtnlion.com 204.13.164.164
    US WI ntp1.netwrx1.com 108.76.168.145
    US WI ntp3.netwrx1.com 108.76.168.147
    US WI ntp3.sf-bay.org 206.55.70.42
    US WI Madison ntp1.cs.wisc.edu 128.105.39.11
    US WI Madison ntp2.cs.wisc.edu 128.105.38.11
    US WI Madison ntp3.cs.wisc.edu 128.105.37.11
    VE ve.pool.ntp.org 190.202.98.221
    VN vn.pool.ntp.org 113.161.84.122
    YU yu.pool.ntp.org 212.200.82.130
    ZA za.pool.ntp.org 197.84.150.123
    worldwide pool.ntp.org 5.9.110.236
    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.Dateutil.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 and 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.

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