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121 lines
4.6 KiB
121 lines
4.6 KiB
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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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<h1 class="post-title">Things I Learnt The Hard Way - Always Use Timezones With Your Dates</h1> |
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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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<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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<< <a href="/books/things-i-learnt/start-stupid">Start Stupid</a> |
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<a href="/books/things-i-learnt/use-utf8">Always Use UTF-8 For Your Strings</a> >> |
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