Timezone independent dates javascript

Question

Using javascript/react native + redux i need to save timestamps in a time format that is aware of local time when saving the date, but unaware when using the date in another timezone.

Take a hypothetical user that travels in around the world in one day, saving a time stamp every hour, all i different timezones, all at 2021-01-30 at 18:00 hours local time. Resulting in 24 timestamps at 18:00. Using a function in the likes of isWithinInterval from date-fns in a similar fashion as below, all timestamps return true.

isWithinInterval(
  timestamp,
  {start: new Date(2021,0,30,17,30}, end: new Date(2021,0,30,18,30)}, 
) // -> true

How do one go about doing this? Preferrably in a react-redux compatiable (serializable) way.

Answer 1

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