Marc Mintel
5397309103
Some checks failed
Build & Deploy / 🔍 Prepare (push) Successful in 20s
Build & Deploy / 🧪 QA (push) Failing after 34s
Build & Deploy / 🏗️ Build (push) Has started running
Build & Deploy / 🚀 Deploy (push) Has been cancelled
Build & Deploy / 🧪 Smoke Test (push) Has been cancelled
Build & Deploy / ⚡ Lighthouse (push) Has been cancelled
Build & Deploy / 🔔 Notify (push) Has been cancelled
73 lines
2.3 KiB
Plaintext
73 lines
2.3 KiB
Plaintext
import { tzOffset } from "../tzOffset/index.js";
|
|
|
|
/**
|
|
* Time interval.
|
|
*/
|
|
|
|
/**
|
|
* Time zone change record.
|
|
*/
|
|
|
|
/**
|
|
* The function scans the time zone for changes in the given interval.
|
|
*
|
|
* @param timeZone - Time zone name (IANA or UTC offset)
|
|
* @param interval - Time interval to scan for changes
|
|
*
|
|
* @returns Array of time zone changes
|
|
*/
|
|
export function tzScan(timeZone, interval) {
|
|
const changes = [];
|
|
const monthDate = new Date(interval.start);
|
|
monthDate.setUTCSeconds(0, 0);
|
|
const endDate = new Date(interval.end);
|
|
endDate.setUTCSeconds(0, 0);
|
|
const endMonthTime = +endDate;
|
|
let lastOffset = tzOffset(timeZone, monthDate);
|
|
while (+monthDate < endMonthTime) {
|
|
// Month forward
|
|
monthDate.setUTCMonth(monthDate.getUTCMonth() + 1);
|
|
|
|
// Find the month where the offset changes
|
|
const offset = tzOffset(timeZone, monthDate);
|
|
if (offset != lastOffset) {
|
|
// Rewind a month back to find the day where the offset changes
|
|
const dayDate = new Date(monthDate);
|
|
dayDate.setUTCMonth(dayDate.getUTCMonth() - 1);
|
|
const endDayTime = +monthDate;
|
|
lastOffset = tzOffset(timeZone, dayDate);
|
|
while (+dayDate < endDayTime) {
|
|
// Day forward
|
|
dayDate.setUTCDate(dayDate.getUTCDate() + 1);
|
|
|
|
// Find the day where the offset changes
|
|
const offset = tzOffset(timeZone, dayDate);
|
|
if (offset != lastOffset) {
|
|
// Rewind a day back to find the time where the offset changes
|
|
const hourDate = new Date(dayDate);
|
|
hourDate.setUTCDate(hourDate.getUTCDate() - 1);
|
|
const endHourTime = +dayDate;
|
|
lastOffset = tzOffset(timeZone, hourDate);
|
|
while (+hourDate < endHourTime) {
|
|
// Hour forward
|
|
hourDate.setUTCHours(hourDate.getUTCHours() + 1);
|
|
|
|
// Find the hour where the offset changes
|
|
const hourOffset = tzOffset(timeZone, hourDate);
|
|
if (hourOffset !== lastOffset) {
|
|
changes.push({
|
|
date: new Date(hourDate),
|
|
change: hourOffset - lastOffset,
|
|
offset: hourOffset
|
|
});
|
|
}
|
|
lastOffset = hourOffset;
|
|
}
|
|
}
|
|
lastOffset = offset;
|
|
}
|
|
}
|
|
lastOffset = offset;
|
|
}
|
|
return changes;
|
|
} |