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gets current and next dates based on day of week and week number
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| var _ = require('lodash'); | |
| var today = new Date('9/30/2014'); | |
| var dayOfWeek = "tuesday"; | |
| var weekNumber = 4; | |
| console.log(getCurrentAndNext(today, dayOfWeek, weekNumber)); | |
| function getCurrentAndNext(today, dayOfWeek, weekNumber) { | |
| var result = { current: void 0, next: void 0 }; | |
| var calcDate = getDateOfNumberedDayOfWeek(dayOfWeek, today.getMonth(), weekNumber); | |
| if (calcDate.getTime() < today.getTime() || compareJustDate(calcDate, today) === 0) { | |
| result.current = calcDate; | |
| result.next = getDateOfNumberedDayOfWeek(dayOfWeek, today.getMonth() + 1, weekNumber); | |
| } | |
| else { | |
| result.current = getDateOfNumberedDayOfWeek(dayOfWeek, today.getMonth() - 1, weekNumber); | |
| result.next = calcDate; | |
| } | |
| return result; | |
| } | |
| function getDateOfNumberedDayOfWeek(dayOfWeek, month, weekNumber) { | |
| weekNumber = weekNumber - 1; | |
| var weeks = calculateWeeks(month); | |
| if (weeks[0][dayOfWeek] === void 0) | |
| weekNumber++; | |
| var week = weeks[weekNumber]; | |
| return week[dayOfWeek]; | |
| } | |
| function calculateWeeks(month) { | |
| var date = new Date(); | |
| date.setMonth(month, 1); | |
| var weeks = {}; | |
| var weekCounter = 0; | |
| while (month === date.getMonth()) { | |
| if (date.getDay() / 6 === 0) | |
| weekCounter++; | |
| if (weeks[weekCounter] === void 0) | |
| weeks[weekCounter] = {}; | |
| weeks[weekCounter][getDayOfWeekString(date.getDay())] = new Date(date.getTime()); | |
| date.setDate(date.getDate() + 1); | |
| } | |
| return weeks; | |
| } | |
| function compareJustDate(datetime1, datetime2) { | |
| var d1 = new Date(datetime1.getMonth() + '/' + datetime1.getDate() + '/' + datetime1.getFullYear()); | |
| var d2 = new Date(datetime2.getMonth() + '/' + datetime2.getDate() + '/' + datetime2.getFullYear()); | |
| if (d1 < d2) return -1; | |
| else if (d1 > d2) return 1; | |
| else return 0; | |
| } | |
| function getDayOfWeekString(dayOfWeekInt) { | |
| switch (dayOfWeekInt) { | |
| case 0: return "sunday"; | |
| case 1: return "monday"; | |
| case 2: return "tuesday"; | |
| case 3: return "wednesday"; | |
| case 4: return "thursday"; | |
| case 5: return "friday"; | |
| case 6: return "saturday"; | |
| } | |
| throw new Error("Unable to determine day of week from: " + dayOfWeekInt); | |
| } |
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