GMT vs UTC
Thaum nws los txog rau lub sijhawm khaws cia, ib tus yuav tsum paub tias lub sijhawm sib txawv ntawm GMT thiab UTC yog ib feem ntawm ob thiab, rau ntau lub hom phiaj, qhov sib txawv tsis tseem ceeb thiab suav tias tsis muaj qhov sib txawv. Txawm li cas los xij, muaj qee qhov sib txawv ntawm GMT thiab UTC thaum nws los txog rau kev siv. Ua ntej nkag mus rau qhov sib txawv, cia peb xub pom dab tsi GMT thiab UTC sawv rau. GMT yog Greenwich Mean Sijhawm thaum UTC yog Lub Sijhawm Sib Koom Tes. GMT yog hais txog lub sijhawm tswj hwm ntawm Royal Observatory hauv Greenwich, London hu ua lub sijhawm hnub ci nruab nrab. UTC yog raws li International Atomic Time (TAI).
GMT yog dab tsi?
GMT, uas sawv cev rau Greenwich Mean Time, yog raws li kev soj ntsuam astronomical. GMT yog lub teb chaws raws sij hawm tus qauv. Nws yog siv feem ntau los ntawm lub cev cuam tshuam nrog United Kingdom xws li BBC World Service, Royal Navy, thiab Met Office. Raws li qhov tseeb, ntau lub tebchaws tau txais GMT hauv lawv txoj cai. Lawv yog United Kingdom, Belgium, Republic of Ireland, thiab Canada.
UTC yog dab tsi?
UTC, uas sawv cev rau Lub Sijhawm Sib Koom Tes Universal, yog lub sijhawm ntsuas thoob ntiaj teb pom zoo los ntawm International Bureau of Weights and Measures (BIPM) raws li kev cai lij choj rau lub sijhawm. Nws yog ib txoj hauv kev ntsuas lub sij hawm siv atomic moos. Txhawm rau txiav txim siab tus qauv thoob ntiaj teb ntawm Kev Sib Koom Tes Universal Sijhawm, Lub Chaw Haujlwm Saib Xyuas Kev Nyuaj Siab thiab Kev Ntsuas (BIPM) hauv Paris Coordinates cov ntaub ntawv los ntawm atomic moos nyob rau hauv lub sij hawm soj ntsuam thoob plaws ntiaj teb. Nws yog qhov nthuav kom nco ntsoov tias leap vib nas this ntxiv rau UTC los them nyiaj rau qhov kev sib hloov qeeb ntawm lub ntiaj teb. Nws yog ib qho tseem ceeb kom paub tias leap vib nas this yog siv los tso cai rau UTC los taug qab lub sijhawm nruab hnub nruab hnub hauv Royal Observatory hauv Greenwich, London.
UTC yog lub sijhawm tus qauv siv rau Internet thiab World Wide Web qauv. Nws tseem yog lub hauv paus ntawm satellite ntiaj teb qhov chaw tso qhov system (GPS). UTC yog siv los ntawm Network Time Protocol, tsim los synchronize lub moos ntawm ntau lub khoos phis tawj hauv Is Taws Nem. Yog li, nws tuaj yeem hais tias UTC yog Internet raws sij hawm tus qauv.
Qhov txawv ntawm Greenwich Mean Time thiab Coordinated Universal Time yog ntsuas nyob rau hauv feem ntawm ib tug thib ob. Hauv kev siv ib txwm, thaum feem ntawm ib qho thib ob suav hais tias tsis tseem ceeb, GMT tuaj yeem muab sib npaug rau UTC. Lub sijhawm sib txawv yog qhov tseem ceeb, txawm li cas los xij, hauv kev tshawb fawb.
Nws feem ntau xav tias thaj tsam lub sijhawm thoob ntiaj teb yog qhov zoo lossis qhov tsis zoo los ntawm UTC. Qhov tseeb, nws yog qhov tseeb heev uas UTC hloov GMT raws li lub sijhawm siv sijhawm tseem ceeb hauv ntau thaj tsam.
Vim li cas thiaj hu ua UTC? Lub International Telecommunication Union txwv tsis pub hu ua ITU xav tias nws yog qhov zoo tshaj plaws kom muaj ib lub npe luv rau siv rau txhua hom lus kom tsis txhob muaj kev ntxhov siab rau qhov zoo. Qhov tseeb, lawv tsis tuaj yeem tuaj txog ntawm qhov kev txiav txim siab seb puas yuav tsum muaj lus Askiv lossis lus Fabkis txoj lus txiav txim thiab yog li vim li cas cov lus luv UTC raug xaiv.
Qhov txawv ntawm GMT thiab UTC yog dab tsi?
• GMT yog rau Greenwich Mean Sijhawm thiab UTC rau Lub Sijhawm Sib Koom Tes.
• Greenwich Mean Time yog raws li kev soj ntsuam astronomical.
• Coordinated Universal Time (UTC) yog lub sijhawm ntsuas thoob ntiaj teb pom zoo los ntawm International Bureau of Weights and Measures (BIPM) raws li kev cai lij choj rau lub sijhawm. Nws yog ib txoj hauv kev ntsuas lub sijhawm siv atomic moos.
• Lub sijhawm sib txawv ntawm UTC thiab GMT nyob hauv feem ntawm ib thib ob. Yog li ntawd, rau cov hom phiaj, ob lub sij hawm raug suav hais tias tib yam. Tab sis, lub sijhawm sib txawv yog qhov tseem ceeb rau kev tshawb fawb.
• GMT tau txais los ntawm lawv txoj cai lij choj xws li hauv tebchaws xws li United Kingdom, Belgium, Republic of Ireland thiab Canada.
• UTC yog lub sijhawm tus qauv siv rau ntau tus qauv hauv Internet thiab World Wide Web.
• Nws tuaj yeem hais tias UTC yog Internet raws sijhawm tus qauv whereas GMT yog lub tebchaws raws sijhawm tus qauv.
