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FIX: improves recurring by ensuring DST is computed correctly (#8410)

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Joffrey JAFFEUX 2019-11-25 23:32:24 +01:00 committed by GitHub
parent 6e403f20ee
commit cfa6ec8034
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 23 additions and 8 deletions
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31
plugins/discourse-local-dates/assets/javascripts/discourse-local-dates.js.no-module.es6
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@ -22,7 +22,6 @@
const dateTime = options.time
? `${options.date} ${options.time}`
: options.date;
let utcDateTime;
let displayedTimezone;
if (options.time) {
@ -33,6 +32,7 @@
}
// if timezone given we convert date and time from given zone to Etc/UTC
let utcDateTime;
if (options.timezone) {
utcDateTime = _applyZoneToDateTime(dateTime, options.timezone);
} else {
@ -43,7 +43,7 @@
// if event is in the past we want to bump it no next occurrence when
// recurring is set
if (options.recurring) {
utcDateTime = _applyRecurrence(utcDateTime, options.recurring);
utcDateTime = _applyRecurrence(utcDateTime, options);
} else {
$element.addClass("past");
}
@ -199,22 +199,37 @@
return dateTime;
}
function _applyRecurrence(dateTime, recurring) {
function _applyRecurrence(dateTime, { recurring, timezone }) {
const parts = recurring.split(".");
const count = parseInt(parts[0], 10);
const type = parts[1];
const diff = moment().diff(dateTime, type);
const add = Math.ceil(diff + count);
const wasDST = dateTime.isDST();
let dateTimeWithRecurrence = dateTime.add(add, type);
const isDST = dateTimeWithRecurrence.isDST();
// we create new moment object from format
// to ensure it's created in user context
const wasDST = moment(dateTime.format()).isDST();
let dateTimeWithRecurrence = moment(dateTime).add(add, type);
const isDST = moment(dateTimeWithRecurrence.format()).isDST();
// these dates are more or less DST "certain"
const noDSTOffset = moment
.tz({ month: 0, day: 1 }, timezone || "Etc/UTC")
.utcOffset();
const withDSTOffset = moment
.tz({ month: 5, day: 1 }, timezone || "Etc/UTC")
.utcOffset();
// we remove the DST offset present when the date was created,
// and add current DST offset
if (!wasDST && isDST) {
dateTimeWithRecurrence.subtract(1, "hour");
dateTimeWithRecurrence.add(-withDSTOffset + noDSTOffset, "minutes");
}
// we add the DST offset present when the date was created,
// and remove current DST offset
if (wasDST && !isDST) {
dateTimeWithRecurrence.add(1, "hour");
dateTimeWithRecurrence.add(withDSTOffset - noDSTOffset, "minutes");
}
return dateTimeWithRecurrence;