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'''Waktu Universal Terkoordinasi''' (bahasa Inggris: ''Coordinated Universal Time'', bahasa Prancis: ''Temps Universel Coordonné'', singkatan resmi: '''UTC'''), sering disebut sebagai '''Waktu Zulu''' adalah perwujudan dari waktu atom dari (UT) atau (GMT). Waktu ini adalah dasar dari .di seluruh dunia adalah ditampilkan sebagai tambahan positif atau negatif dari UT. Beda UTC dari adalah sejumlah beberapa detik genap (bukan pecahan), sesuai dengan waktu yang dihitung oleh jam atom. Beda UTC dari UT hanya sepersekian detik.
UTC adalah ukuran waktu campuran: kecepatan dari UTC adalah berdasarkan yang dihitung oleh standar jam atom, tetapi dari UTC dicocokkan selalu supaya dekat dengan waktu UT yang berdasarkan data astronomi. Putaran sedikit demi sedikit mengalami perlambatan (karena efek pengereman oleh pasang-surut), sehingga semakin bertambah semenjak diperkenalkannya TAI. Karena alasan ini, UT adalah "lebih lambat" dari TAI. UTC selalu dipertahankan untuk berada dalam 0.9 detik dari (UT1 adalah satu dari tiga definisi UT yang paling akurat); akan ditambahkan ke (atau mungkin bisa juga dikurangkan dari) UTC disetiap akhir bulan. Hingga saat ini, penambahan/pengurangan detik kabisat ini (yang pertama tahun 1972) selalu dalam harga positif, dan dilakukan pada tanggal 30 Juni atau 31 Desember, di mana penambahan detik kabisat dinamakan sebagai jam 23:59:60. Pengumuman dari detik kabisat ini dilakukan oleh (IERS - Sistem Internasional Pelayanan Putaran Bumi dan Referensi), berdasarkan pengukuran akurat dari prakiraan dari putaran bumi. Secara sejarah, satu detik kabisat selalu diperlukan setiap satu atau dua tahun sekali. Namun, detik kabisat sudah lama tidak ditambahkan semenjak tahun 1998, karena perlambatan bumi telah berkurang secara sementara dalam 7 tahun terakhir ini. Detik kabisat yang lalu, seperti pernah diumumkan IERS pada bulan Juli 2005, terjadi pada tanggal 31 Desember 2005.
Untuk keperluan praktis, dan untuk keperluan perdagangan dan hukum, perbedaan kecil (dalam pecahan detik) antara UTC dan UT (atau GMT) adalah dianggap kecil, dan karena alasan ini, dalam percakapan biasa UTC sering disebutkan sebagai GMT, walaupun sebenarnya secara teknis ini adalah tidak tepat. (WIB) adalah sama dengan UTC+7.
== Catatan ==
* {{fnb|1}} WUT dibuat oleh sekelompok ilmuwan internasional, dan mereka tidak mencapai kesepakatan untuk menggunakan singkatan dalam bahasa Inggris, CUT, atau bahasa Prancis, TUC, maka dicarilah jalan tengah yaitu dengan singkatan UTC.<ref>http://tf.nist.gov/general/misc.htm#Anchor-14550.</ref>
== Referensi ==
=== Catatan ===
{{reflist}}
=== Bibilografi ===
{{refbegin|30em}}
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{{refend}}
== Lihat pula ==
* [[Waktu Atom Internasional]] ([[Waktu Atom Internasional|TAI]])
* [[Universal Time|Waktu Universal]] ([[Universal Time]]) juga termasuk definisi UT1
* [[Waktu Sidereal]] ([[Waktu Sidereal|Sidereal Time]])
* [[Waktu Ephemeris]] ([[Waktu Ephemeris|Ephemeris Time]])
* [[Waktu Matahari]]
* [[Jam atom]]
== Pranala luar ==
{{Wiktionary|UTC}}
* [http://www.cl.cam.ac.uk/~mgk25/time/zeitgesetz.en.html Definition of Coordinated Universal Time in German law–ZeitG §1 (3)]
* [http://hpiers.obspm.fr/eop-pc/earthor/utc/TAI-UTC_tab.html International Earth Rotation Service; list of differences between TAI and UTC from 1961 to present]
* [http://www.usno.navy.mil/USNO/time/master-clock/systems-of-time U.S. Naval Observatory: Systems of Time]
* [http://www.w3.org/TR/NOTE-datetime W3C Specification about UTC Date and Time] and [[IETF]] [[Internet standard]] RFC 3339, based on [[ISO 8601]]
* [http://www.ipses.com/prod/timing/UTC-GPS.php?language=en Standard of time definition: UTC, GPS, LORAN and TAI]
* [https://itunews.itu.int/En/4271-What-is-in-a-nameBROn-the-term-Coordinated-Universal-Time.note.aspx What is in a name? On the term Coordinated Universal Time]
{{Perbedaan waktu UTC}}
[[Kategori:Sistem koordinat langit]]
[[fi:Aikajärjestelmä#UTC]]
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