import '../_setup.js'; import { stripTime, dateValue, today, addDays, addWeeks, addMonths, addYears, dayOfTheWeekOf, getWeek, startOfYearPeriod } from '../../../js/lib/date.js'; describe('lib/date', function () { describe('stripTime()', function () { it('returns the time value of 00:00:00 local time of given time value or date', function () { let origDate = new Date(2016, 8, 24, 13, 55, 32, 235); expect(stripTime(origDate.getTime()), 'to be', new Date(2016, 8, 24).getTime()); origDate = new Date(2019, 1, 14, 20, 55); expect(stripTime(origDate), 'to be', new Date(2019, 1, 14).getTime()); }); }); describe('today()', function () { it('returns the time value of 00:00:00 local time of current date', function () { const now = new Date(); const timeValue = today(); expect(timeValue, 'to be', now.setHours(0, 0, 0, 0)); }); }); describe('dateValue()', function () { it('returns the time value of 00:00:00 local time of the date created by given Date constructor parameters', function () { // from Date object let origDate = new Date(2016, 8, 24, 13, 55, 32, 235); let timeValue = dateValue(origDate); expect(timeValue, 'to be', new Date(2016, 8, 24).getTime()); // from Date constructor args timeValue = dateValue(2019, 1, 17, 9, 43, 18, 953); expect(timeValue, 'to be', new Date(2019, 1, 17).getTime()); // from string let origDateStr = '2020-04-20T02:27:15Z'; origDate = new Date(origDateStr); timeValue = dateValue(origDateStr); expect(timeValue, 'to be', origDate.setHours(0, 0, 0, 0)); // from time value origDate = new Date(2016, 8, 24, 13, 55, 32, 235); timeValue = dateValue(origDate.getTime()); expect(timeValue, 'to be', new Date(2016, 8, 24).getTime()); }); it('does not map 2-digit year to 1900\'s', function () { let date = new Date(dateValue(86, 8, 24)); expect(date.getFullYear(), 'to be', 86); expect(date.getMonth(), 'to be', 8); expect(date.getDate(), 'to be', 24); date = new Date(dateValue(19, 1, 17)); expect(date.getFullYear(), 'to be', 19); expect(date.getMonth(), 'to be', 1); expect(date.getDate(), 'to be', 17); }); }); describe('addDays()', function () { it('returns the time value of N days after a date or time value', function () { let date1 = new Date(2019, 11, 31); let date2 = addDays(date1, 1); expect(date2, 'to be', new Date(2020, 0, 1).getTime()); expect(addDays(date2, 30), 'to be', new Date(2020, 0, 31).getTime()); date1 = new Date(2020, 0, 1); expect(addDays(date1, -1), 'to be', new Date(2019, 11, 31).getTime()); expect(addDays(date1, -10), 'to be', new Date(2019, 11, 22).getTime()); }); }); describe('addWeeks()', function () { it('returns the time value of N weeks after a date or time value', function () { let date1 = new Date(2019, 11, 28); let date2 = addWeeks(date1, 1); expect(date2, 'to be', new Date(2020, 0, 4).getTime()); expect(addWeeks(date2, 4), 'to be', new Date(2020, 1, 1).getTime()); date1 = new Date(2020, 0, 4); expect(addWeeks(date1, -1), 'to be', new Date(2019, 11, 28).getTime()); expect(addWeeks(date1, -8), 'to be', new Date(2019, 10, 9).getTime()); }); }); describe('addMonths()', function () { it('returns the time value of N months after a date or time value', function () { let date1 = new Date(2019, 11, 31); let date2 = addMonths(date1, 1); expect(date2, 'to be', new Date(2020, 0, 31).getTime()); expect(addMonths(date2, 29), 'to be', new Date(2022, 5, 30).getTime()); date1 = new Date(2020, 0, 1); expect(addMonths(date1, -1), 'to be', new Date(2019, 11, 1).getTime()); expect(addMonths(date1, -18), 'to be', new Date(2018, 6, 1).getTime()); }); it('returns the end of the next/prev month if the day of the old date is not in the new month', function () { let date = new Date(2019, 9, 31); expect(addMonths(date, 1), 'to be', new Date(2019, 10, 30).getTime()); expect(addMonths(date, 18), 'to be', new Date(2021, 3, 30).getTime()); date = new Date(2019, 11, 31); expect(addMonths(date, -1), 'to be', new Date(2019, 10, 30).getTime()); expect(addMonths(date, -30), 'to be', new Date(2017, 5, 30).getTime()); date = new Date(2019, 0, 31); expect(addMonths(date, 1), 'to be', new Date(2019, 1, 28).getTime()); expect(addMonths(date, 13), 'to be', new Date(2020, 1, 29).getTime()); date = new Date(2020, 0, 31); expect(addMonths(date, 1), 'to be', new Date(2020, 1, 29).getTime()); expect(addMonths(date, 13), 'to be', new Date(2021, 1, 28).getTime()); date = new Date(2019, 2, 30); expect(addMonths(date, -1), 'to be', new Date(2019, 1, 28).getTime()); expect(addMonths(date, -37), 'to be', new Date(2016, 1, 29).getTime()); date = new Date(2020, 2, 30); expect(addMonths(date, -1), 'to be', new Date(2020, 1, 29).getTime()); expect(addMonths(date, -37), 'to be', new Date(2017, 1, 28).getTime()); date = new Date(2020, 1, 29); expect(addMonths(date, 12), 'to be', new Date(2021, 1, 28).getTime()); expect(addMonths(date, -24), 'to be', new Date(2018, 1, 28).getTime()); }); }); describe('addYears()', function () { it('returns the time value of N years after a date or time value', function () { let date1 = new Date(2019, 11, 31); let date2 = addYears(date1, 1); expect(date2, 'to be', new Date(2020, 11, 31).getTime()); expect(addYears(date2, 3), 'to be', new Date(2023, 11, 31).getTime()); date1 = new Date(2020, 0, 1); expect(addYears(date1, -1), 'to be', new Date(2019, 0, 1).getTime()); expect(addYears(date1, -3), 'to be', new Date(2017, 0, 1).getTime()); }); it('returns 2/28 of the year if the old date is 2/29 and the new year is not a leap year', function () { const date = new Date(2020, 1, 29); expect(addYears(date, 1), 'to be', new Date(2021, 1, 28).getTime()); expect(addYears(date, -1), 'to be', new Date(2019, 1, 28).getTime()); expect(addYears(date, -4), 'to be', new Date(2016, 1, 29).getTime()); }); }); describe('dayOfTheWeekOf()', function () { it('returns a date object of given day of the week of given date', function () { expect(dayOfTheWeekOf(new Date(2017, 0, 1), 0), 'to be', new Date(2017, 0, 1).getTime()); expect(dayOfTheWeekOf(new Date(2017, 3, 5), 1), 'to be', new Date(2017, 3, 3).getTime()); expect(dayOfTheWeekOf(new Date(2017, 5, 8), 2), 'to be', new Date(2017, 5, 6).getTime()); expect(dayOfTheWeekOf(new Date(2017, 9, 31), 3), 'to be', new Date(2017, 10, 1).getTime()); expect(dayOfTheWeekOf(new Date(2018, 2, 10), 4), 'to be', new Date(2018, 2, 8).getTime()); expect(dayOfTheWeekOf(new Date(2018, 5, 19), 5), 'to be', new Date(2018, 5, 22).getTime()); expect(dayOfTheWeekOf(new Date(2018, 10, 20), 6), 'to be', new Date(2018, 10, 24).getTime()); }); it('uses sepecified start day of week if it is given', function () { expect(dayOfTheWeekOf(new Date(2017, 0, 1), 0, 1), 'to be', new Date(2017, 0, 1).getTime()); expect(dayOfTheWeekOf(new Date(2017, 3, 5), 1, 3), 'to be', new Date(2017, 3, 10).getTime()); expect(dayOfTheWeekOf(new Date(2017, 5, 8), 2, 4), 'to be', new Date(2017, 5, 13).getTime()); expect(dayOfTheWeekOf(new Date(2017, 9, 31), 3, 6), 'to be', new Date(2017, 10, 1).getTime()); expect(dayOfTheWeekOf(new Date(2018, 2, 10), 4, 5), 'to be', new Date(2018, 2, 15).getTime()); expect(dayOfTheWeekOf(new Date(2018, 5, 19), 5, 2), 'to be', new Date(2018, 5, 22).getTime()); }); }); describe('getWeek()', function () { it('returns ISO week number of given date', function () { expect(getWeek(new Date(2015, 0, 1)), 'to be', 1); expect(getWeek(new Date(2015, 3, 26)), 'to be', 17); expect(getWeek(new Date(2015, 8, 12)), 'to be', 37); expect(getWeek(new Date(2015, 10, 15)), 'to be', 46); expect(getWeek(new Date(2016, 0, 1)), 'to be', 53); expect(getWeek(new Date(2016, 0, 7)), 'to be', 1); expect(getWeek(new Date(2016, 6, 21)), 'to be', 29); expect(getWeek(new Date(2016, 8, 6)), 'to be', 36); expect(getWeek(new Date(2016, 11, 1)), 'to be', 48); expect(getWeek(new Date(2017, 0, 1)), 'to be', 52); }); }); describe('startOfYearPeriod()', function () { it('returns the start year of given length of period of years', function () { let date = new Date(2121, 0, 1); expect(startOfYearPeriod(date, 10), 'to be', 2120); expect(startOfYearPeriod(date, 100), 'to be', 2100); expect(startOfYearPeriod(date, 1000), 'to be', 2000); date = new Date(1984, 0, 1); expect(startOfYearPeriod(date, 10), 'to be', 1980); expect(startOfYearPeriod(date, 100), 'to be', 1900); expect(startOfYearPeriod(date, 1000), 'to be', 1000); expect(startOfYearPeriod(new Date(738, 5, 30), 20), 'to be', 720); expect(startOfYearPeriod(new Date(0, 5, 30).setFullYear(88), 25), 'to be', 75); }); }); });