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liam-jones-lucout/isBritishSummerTimeInEffect.ts

Last active September 23, 2024 09:59
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Is British Summer time BST
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isBritishSummerTimeInEffect.ts
export function isBritishSummerInEffect(date: Date) {
const possibleBstHour = parseInt(
date
.toLocaleTimeString("en-GB", { timeZone: "Europe/London" })
.split(":")[0],
);
const utcHour = date.getUTCHours();
return possibleBstHour !== utcHour;
}
export function isCurrentlyBritishSummerTime() {
return isBritishSummerInEffect(new Date())
}
@Twovo
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Twovo commented Jul 16, 2024

I think this is incorrect, shouldn't line 7 be date.getUTCHours()? Instead of now.getUTCHours()?

@liam-jones-lucout
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liam-jones-lucout commented Sep 23, 2024 •
edited
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I think this is incorrect, shouldn't line 7 be date.getUTCHours()? Instead of now.getUTCHours()?

Nice spot! Where I initially used this just checked if BST was currently in effect. I added the date argument as a quick upgrade, but forgot to update that line. Cheers 👍

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