Video: Vim li cas Lub Ib Hlis 1 1970 yog lub sijhawm?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
vim nws ib txwm 1st peb 1970 , vim -'1st Lub Ib Hlis 1970 ' feem ntau hu ua " lub sijhawm date" yog hnub tim thaum lub sij hawm pib rau Unix computers, thiab cov timestampis cim li '0'. Txhua lub sij hawm txij li hnub ntawd yog xam raws li tus naj npawb ntawm vib nas this dhau los.
Tsis tas li ntawd, dab tsi yog tus nqi epoch?
Unix lub sijhawm (tseem hu ua Epoch lub sij hawm, POSIX lub sij hawm, vib nas this txij li thaum lub Epoch , los yog UNIX Epoch time) yog asystem rau piav qhia txog lub sijhawm. Nws yog tus naj npawb ntawm cov vib nas this uas tau dhau mus txij li Unix lub sijhawm , uas yog lub sij hawm 00:00:00 UTC ntawm 1 Lub Ib Hlis 1970, rho tawm vib nas this.
Ib yam li ntawd, dab tsi yog lub sijhawm hauv computer science? Hauv ib suav context, ib lub sijhawm yog hnub tim thiab lub sij hawm txheeb ze uas a computer cov moos thiabtimestamp tus nqi raug txiav txim. Cov lub sijhawm ib txwm sib raug rau 0 teev, 0 feeb, thiab 0 vib nas this (00: 00: 00) Lub Sijhawm Sib Koom Tes (UTC) ntawm ib hnub tshwj xeeb, uas txawv ntawm qhov system mus rau qhov system.
Ib yam li ntawd, ib tug yuav nug, vim li cas peb thiaj siv lub sijhawm?
Ib lub sijhawm txhais tau tias ib qho instant hauv sij hawm choosenas lub hauv paus chiv keeb ntawm ib tug tshwj xeeb era. The " lub sijhawm " tom qab ntawd ua haujlwm rau lub ntsiab lus siv los ntawm qhov twg lub sijhawm yog ntsuas. Sijhawm ntsuas ntsuas ntsuas yog suav los ntawm lub sijhawm thiaj li hnub thiab sij hawm ntawm cov xwm txheej ua tau yuav tsum tau teev unambiguously.
Vim li cas Time_t kos npe?
10 Teb. Cov time_t Wikipedia tsab xov xwm nthuav tawm qee qhov teeb meem ntawm qhov no. Unix thiab POSIX-raws li systemsimplement lub time_t type as a kos npe integer (feem ntau yog 32 lossis 64 qhov dav) uas sawv cev rau tus lej thib ob txij thaum pib ntawm Unix epoch: ib tag hmo UTC ntawm Lub Ib Hlis 1, 1970 (tsis suav leap vib nas this).
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