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Add 1 Day is timezone sensitive in moment
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function addDayTest(day, tz) { | |
const start = moment.tz(day, 'YYYY-MM-DD', tz); | |
const plusDay = start.clone().add(1, 'day'); // Next calendar day at same time. | |
const plusHours = start.clone().add(24, 'hours'); // 24 hours in the future. | |
return { | |
start: start.valueOf() / 1000, | |
plusDay: plusDay.valueOf() / 1000, | |
plusHours: plusHours.valueOf() / 1000, | |
diff: (plusHours - plusDay) / 1000, // How different are "1 day" and "24 hours"? | |
}; | |
} | |
addDayTest('2020-03-07', 'America/Chicago') | |
// Object { start: 1583560800, plusDay: 1583647200, plusHours: 1583647200, diff: 0 } | |
// Daylight savings time "spring forward" date in USA | |
addDayTest('2020-03-08', 'America/Chicago') | |
// Object { start: 1583647200, plusDay: 1583730000, plusHours: 1583733600, diff: 3600 } | |
// UTC observes no DST | |
addDayTest('2020-03-08', 'UTC') | |
// Object { start: 1583625600, plusDay: 1583712000, plusHours: 1583712000, diff: 0 } | |
// Phoenix (and most of Arizona) observe no DST | |
addDayTest('2020-03-08', 'America/Phoenix') | |
// Object { start: 1583650800, plusDay: 1583737200, plusHours: 1583737200, diff: 0 } |
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