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link to JS equality rules

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Scott Lamb 2022-03-07 13:47:40 -08:00
parent 93792fcc57
commit 3c1171e405
1 changed files with 6 additions and 4 deletions
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10
ui/src/List/TimerangeSelector.tsx
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@ -152,10 +152,12 @@ const combine = (dayMillis: number, time: Date | null) => {
*
* These are stored in a funny format: number of milliseconds since epoch of
* the start of the given day in the browser's time zone. This is because
* (a) Date objects are always in the local time zone and date-fn rolls with
* that, and (b) Date objects don't work well in a set. Javascript's
* "same-value-zero algorithm" means that two different Date objects never
* compare the same.
*
* 1. `Date` objects are always in the browser's time zone and `date-fn` rolls
* with that, and
* 2. `Date` objects don't work well in a `Set`. ECMAScript's [equality
* rules](https://262.ecma-international.org/7.0/#sec-abstract-equality-comparison)
* mean that two different `Date` objects never compare the same.
*/
type AllowedDays = {
minMillis: number;