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122 lines
4.6 KiB
122 lines
4.6 KiB
11 months ago
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta http-equiv="content-type" content="text/html; charset=utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1, viewport-fit=cover">
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<title>Julio Biason .Me 4.3</title>
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<!-- CSS -->
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<link rel="stylesheet" href="https://blog.juliobiason.me/print.css" media="print">
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<link rel="stylesheet" href="https://blog.juliobiason.me/poole.css">
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<link rel="stylesheet" href="https://blog.juliobiason.me/hyde.css">
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<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=PT+Sans:400,400italic,700|Abril+Fatface">
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</head>
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<body class=" ">
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<div class="sidebar">
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<div class="container sidebar-sticky">
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<div class="sidebar-about">
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<a href="https://blog.juliobiason.me"><h1>Julio Biason .Me 4.3</h1></a>
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<p class="lead">Old school dev living in a 2.0 dev world</p>
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</div>
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<ul class="sidebar-nav">
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<li class="sidebar-nav-item"><a href="/">English</a></li>
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<li class="sidebar-nav-item"><a href="/pt">Português</a></li>
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<li class="sidebar-nav-item"><a href="/tags">Tags (EN)</a></li>
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<li class="sidebar-nav-item"><a href="/pt/tags">Tags (PT)</a></li>
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</ul>
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</div>
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</div>
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<div class="content container">
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<div class="post">
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<h1 class="post-title">Things I Learnt The Hard Way - Always Use Timezones With Your Dates</h1>
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<span class="post-date">
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2019-07-01
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<a href="https://blog.juliobiason.me/tags/books/">#books</a>
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<a href="https://blog.juliobiason.me/tags/things-i-learnt/">#things i learnt</a>
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<a href="https://blog.juliobiason.me/tags/dates/">#dates</a>
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<a href="https://blog.juliobiason.me/tags/timezones/">#timezones</a>
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</span>
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<p>No matter if the date you're receiving is in your local timezone and you'll
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display it in your timezone, sooner or later, the fact that you ignored there
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was a timezone behind that date will hurt you.</p>
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<span id="continue-reading"></span>
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<p>(Note: Most of this post when I say "date" you can think of "date and time",
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although the date should also be "timezone aware".)</p>
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<p>At some point of my professional life, ignoring timezones was easy: You just
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pick the date, throw in the database, then read it back and everybody was
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happy.</p>
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<p>But things are not like this anymore. People will access your site from far
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away locations, the source of the date may not be in the same timezone of your
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system, your system may be running in a completely different timezone of your
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dev machine (it's pretty common to run things in our machines in the local
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timezone but the production system will run in UTC), the display may be a
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complete different timezone than your production and dev machine and so on.</p>
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<p>So always carry the timezone with the data. Find modules/classes that support
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dates with timezones (a.k.a. make things <em>timezone aware</em>), capture the
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timezone as soon as possible and carry it around in all operations.
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Modules/classes that don't support timezones for dates/times should, as soon
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as possible, removed from the system.</p>
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<p>Any developers a bit more seasoned -- and by "seasoned" I meant "Had to deal
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with times before" -- will probably claim "Hey, this is <em>obvious</em>!" And I'd
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have to agree. But it's annoying how many times I got bitten by some stupid
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bug 'cause we decided that "well, everything is in the same timezone, so it's
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all good".</p>
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<div>
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<div style="float:left">
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<< <a href="/books/things-i-learnt/start-stupid">Start Stupid</a>
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</div>
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<div style="float:right">
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<a href="/books/things-i-learnt/use-utf8">Always Use UTF-8 For Your Strings</a> >>
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</div>
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</div>
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</div>
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</div>
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</body>
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</html>
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