md`# [rSchedule](https://gitlab.com/john.carroll.p/rschedule) example: Get last or next monday in from a specific time zone`
rschedule = import('@rschedule/rschedule@0.11.6')
// dateAdapter = import('@rschedule/standard-date-adapter@1.0.0')
luxonAdapter = import('@rschedule/luxon-date-adapter@0.11.6')
luxon = import('https://unpkg.com/luxon@1.21.3/src/luxon.js?module')
targetDateRrule = luxon.DateTime.fromObject({year: 2020,
month: 1, //starts at 1
day: 24, //starts at 1
hour: 12, //starts at 0
minute: 0, //starts at 0
zone: 'America/Los_Angeles'})
// zone: 'Africa/Asmera'})
// zone: 'America/New_York'})
// dateInThePastWithDesiredWeekday = targetDateRrule.set({weekday: 5}).minus({weeks: 4})
dateInThePastWithDesiredWeekday = targetDateRrule.set({years:1900}).set({weekday: 4})
dateInThePastWithDesiredWeekday.toHTTP()
schedule = new rschedule.Schedule({
rrules: [
{
// start: luxon.DateTime.local(2014,1,2).setZone('America/Los_Angeles'),
start: dateInThePastWithDesiredWeekday,
frequency: "WEEKLY",
}
],
dateAdapter: luxonAdapter.LuxonDateAdapter,
});
schedule2 = schedule.set('timezone', 'America/Los_Angeles')
// Get the weekday right before or after a certain date.
schedule2
.occurrences({reverse: true, end: targetDateRrule, take:1}) // Get last Thurs @ take=1, 2nd to last Thurs take=2
// .occurrences({reverse: false, start: targetDateRrule, take:1}) // Get next Thurs @ take=1, 2nd Thurs take=2
.toArray()
.map(adapter => adapter.date.toString());
md`# Moment way`
moment = require('moment@2.24.0/moment.js')
function nextDay (dayINeed) {
// const dayINeed = 4; // for Thursday
const today = moment().isoWeekday();
// if we haven't yet passed the day of the week that I need:
if (today <= dayINeed) {
// then just give me this week's instance of that day
return moment().isoWeekday(dayINeed);
} else {
// otherwise, give me *next week's* instance of that same day
return moment().add(1, 'weeks').isoWeekday(dayINeed);
}
}
function getDateOfAWeekday (desiredWeekday, referenceDate = luxon.DateTime.local(), next, timeZoneID) {
const weekdays = ({
SUNDAY: 0,
MONDAY: 1,
TUESDAY: 2,
WEDNESDAY: 3,
THURSDAY: 4,
FRIDAY: 5,
SATURDAY: 6,
})
const desiredWeekdayNumber = weekdays[desiredWeekday]
const referenceDateWeekday = referenceDate.weekday
if (next) {
// if we haven't yet passed the day of the week that I need:
if (referenceDateWeekday <= desiredWeekdayNumber) {
// then just give me this week's instance of that day
// return moment().isoWeekday(desiredWeekdayNumber);
return referenceDate.set({weekday: desiredWeekdayNumber}).setZone(timeZoneID).toString()
} else {
// otherwise, give me *next week's* instance of that same day
return referenceDate.plus({weeks: 1}).set({weekday: desiredWeekdayNumber}).setZone(timeZoneID).toString()
// return moment().add(1, 'weeks').isoWeekday(desiredWeekdayNumber);
}
} else {
}
}
targetDate = luxon.DateTime.fromObject({year: 2020,
month: 1, //starts at 1
day: 24, //starts at 1
hour: 12, //starts at 0
minute: 0, //starts at 0
// zone: 'America/Los_Angeles'}).toString()
// zone: 'Africa/Asmera'}).toString()
zone: 'America/New_York'}).toString()
luxon.DateTime.fromISO('2020-01-24T12:00:00.000Z').setZone('America/New_York', { keepLocalTime: true }).toString()
targetDate.toString()
getDateOfAWeekday ("FRIDAY", targetDate, true, 'America/New_York')
luxon.DateTime.fromISO('2020-01-24T01:56:46.456Z').toString()
Purpose-built for displays of data
Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
