40 lines
1.3 KiB
JavaScript
40 lines
1.3 KiB
JavaScript
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// License: LGPL-3.0-or-later
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const flyd = require('flyd')
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const flyd_every = require('flyd/module/every')
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const moment = require('moment-timezone')
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const format = require('../common/format')
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const pluralize = format.pluralize
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// Given an end dateTime ("2015-11-17 19:00") and a time-zone ("America/Los_Angeles"),
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// if the end dateTime has passed, return false
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// if the end dateTime is more than a day away
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// then return the number of days away
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// if the end dateTime is less than a day away
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// then return a countdown stream with seconds precision
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//
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// This function returns a stream.
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//
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// This function takes a timezone in the format "Country/City"
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// See here: http://momentjs.com/timezone/
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//
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const timeRemaining = (endDateTime, tz) => {
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if(!endDateTime) return flyd.stream(false)
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const format = "YYYY-MM-DD hh:mm:ss zz"
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tz = tz || ENV.nonprofitTimezone || 'America/Los_Angeles'
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const [now, end] = [moment().tz(tz), moment(endDateTime, format).tz(tz).seconds(59)]
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console.log({now, end})
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if(end.isBefore(now)) return flyd.stream(false)
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if(end.diff(now, 'hours') <= 24) {
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return flyd.map(
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t => moment.utc(end.diff(moment(t))).format("HH:mm:ss")
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, flyd_every(1000))
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} else {
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return flyd.stream(pluralize(end.diff(now, 'days'), 'days'))
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}
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}
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module.exports = timeRemaining
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