diff --git a/src/_data/blogroll.json b/src/_data/blogroll.json new file mode 100644 index 0000000..1aabef7 --- /dev/null +++ b/src/_data/blogroll.json @@ -0,0 +1,17 @@ +[ + { + "name": "Robb Knight", + "website": "https://rknight.me", + "rss": "https://rknight.me/subscribe/posts/rss.xml" + }, + { + "name": "Terence Eden", + "website": "https://shkspr.mobi", + "rss": "https://shkspr.mobi/blog/feed/atom/" + }, + { + "name": "Sara Joy", + "website": "https://sarajoy.dev", + "rss": "https://sarajoy.dev/rss.xml" + } +] \ No newline at end of file diff --git a/src/blog/posts/2024/2/why-is-date.parse-weird-in-gmt.md b/src/blog/posts/2024/2/why-is-date.parse-weird-in-gmt.md new file mode 100644 index 0000000..6215ade --- /dev/null +++ b/src/blog/posts/2024/2/why-is-date.parse-weird-in-gmt.md @@ -0,0 +1,18 @@ +--- +title: "TIL: Why Date.parse gives unexpected results for GMT" +tags: + - Javascript + - TIL +--- + +TL;DR: Timezones are weird + +Someone posted about this in a Discord server I'm on: Javascript's Date object has a parse function, [Date.parse](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/parse) that takes a string can converts it to a timestamp. If you give it a non-standard string, in this case `Jan 1, 1970`, it should still parse it. + +The problem is though, that even though we're in GMT, and `GMT == UTC`, `Date.parse("Jan 1, 1970")` results in a timestamp of `-3600000`, or Dec 31, 1969 23:00:00. If you explicitly add the GMT timezone, it's fine. + +It turns out that if you omit the timezone, `Date.parse` will use your system timezone - now in my case that's GMT _today_[^1], but if I were to go back to 1970 I'd actually find that I'd be in BST. This is because the government [experimented with scrapping daylight savings](https://www.rmg.co.uk/stories/topics/uk-time-british-summer-time-bst-daylight-saving). So, when you parse that specific date, your timezone is actually `UTC+1`. + +[^1]: Obviously this only breaks in the UK + + diff --git a/src/blogroll.html b/src/blogroll.html new file mode 100644 index 0000000..6e4af14 --- /dev/null +++ b/src/blogroll.html @@ -0,0 +1,13 @@ +--- +title: Blogroll +layout: page.njk +--- + + +