November 2012
Intermediate to advanced
888 pages
54h 46m
Polish
Content preview from Ruby. Receptury
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3.7. Konwersja czasu między strefami czasowymi
Problem
Chcemy reprezentowaną przez obiekt chwilę czasu przekształcić do postaci równoważnej w innej strefie czasowej.
Rozwiązanie
Najczęściej wykonywanymi konwersjami tego rodzaju są konwersje z czasu lokalnego na czas „uniwersalny” i odwrotnie. Wykonuje się je bardzo prosto w obydwu klasach Time i DateTime.
Metoda Time#gmtime modyfikuje „w miejscu” odnośny obiekt, przekształcając go do postaci zgodnej ze strefą GMT (czyli czasem UTC). Konwersja odwrotna wykonywana jest przez metodę Time#localtime (także modyfikującą obiekt „w miejscu”).
now = Time.now # => Thu Oct 12 02:21:57 Europa Środkowa (czas stand.) 2006 now.gmtime # => Thu Oct 12 00:21:57 UTC 2006 now.localtime # => Thu Oct 12 ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.