If I have a JavaScript date, what is the best way to convert it to match the format used in Swift JSON encoding?
For example, how can I obtain a value of 620102769.132999 for a date like 2020-08-26 02:46:09?
If I have a JavaScript date, what is the best way to convert it to match the format used in Swift JSON encoding?
For example, how can I obtain a value of 620102769.132999 for a date like 2020-08-26 02:46:09?
In the world of Swift programming, JSON encoding by default presents a value representing the number of seconds elapsed since ReferenceDate. If you'd like to delve deeper into this concept, check out: https://developer.apple.com/documentation/foundation/jsonencoder/2895363-dateencodingstrategy
Interestingly enough, it appears that ReferenceDate refers to 00:00:00 UTC on 1 January 2001. For more insights, take a look at: https://developer.apple.com/documentation/foundation/nsdate/1409769-init
If you want to convert a date to its corresponding Swift time interval, here's a handy function:
function dateToSwiftInterval(date: Date): number {
const referenceDate = Date.UTC(2001,0,1);
const timeSpanMs = (date - referenceDate);
return timeSpanMs / 1000;
}
To put this concept into practice, consider the following example with myDate initialized as new Date(1598366769000):
const myDate = new Date(1598366769000);
console.log(dateToSwiftValue(myDate)); // 620102769
In Elwyn's explanation, Swift interprets dates as intervals of time that are measured in seconds since 1 Jan 2001 UTC. On the other hand, Javascript Dates measure time in milliseconds since 1 Jan 1970 UTC. To convert between the two, you just need to account for the difference in reference dates and adjust accordingly.
// Here's a Javascript function to convert a Date to a Swift time interval
// The input parameter 'date' is a Javascript Date object (defaults to current date and time)
function toSwiftTI(date = new Date()) {
return (date - Date.UTC(2001,0,1)) / 1000;
}
console.log(toSwiftTI());Since the time difference remains constant at 978307200000, you may choose to use this value directly instead of recalculating it each time:
return (date - 978307200000) / 1000;
To go from a Swift time interval back to a date, simply multiply by 1,000 and add the constant:
function swiftToDate(ti) {
return new Date(ti * 1000 + 978307200000);
}
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