64 lines
2.1 KiB
JavaScript
64 lines
2.1 KiB
JavaScript
import { getTimezoneOffsetInMilliseconds } from "./_lib/getTimezoneOffsetInMilliseconds.js";
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import { normalizeDates } from "./_lib/normalizeDates.js";
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import { millisecondsInDay } from "./constants.js";
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import { startOfDay } from "./startOfDay.js";
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/**
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* The {@link differenceInCalendarDays} function options.
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*/
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/**
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* @name differenceInCalendarDays
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* @category Day Helpers
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* @summary Get the number of calendar days between the given dates.
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*
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* @description
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* Get the number of calendar days between the given dates. This means that the times are removed
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* from the dates and then the difference in days is calculated.
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*
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* @param laterDate - The later date
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* @param earlierDate - The earlier date
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* @param options - The options object
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*
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* @returns The number of calendar days
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*
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* @example
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* // How many calendar days are between
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* // 2 July 2011 23:00:00 and 2 July 2012 00:00:00?
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* const result = differenceInCalendarDays(
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* new Date(2012, 6, 2, 0, 0),
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* new Date(2011, 6, 2, 23, 0)
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* )
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* //=> 366
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* // How many calendar days are between
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* // 2 July 2011 23:59:00 and 3 July 2011 00:01:00?
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* const result = differenceInCalendarDays(
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* new Date(2011, 6, 3, 0, 1),
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* new Date(2011, 6, 2, 23, 59)
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* )
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* //=> 1
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*/
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export function differenceInCalendarDays(laterDate, earlierDate, options) {
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const [laterDate_, earlierDate_] = normalizeDates(
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options?.in,
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laterDate,
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earlierDate,
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);
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const laterStartOfDay = startOfDay(laterDate_);
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const earlierStartOfDay = startOfDay(earlierDate_);
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const laterTimestamp =
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+laterStartOfDay - getTimezoneOffsetInMilliseconds(laterStartOfDay);
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const earlierTimestamp =
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+earlierStartOfDay - getTimezoneOffsetInMilliseconds(earlierStartOfDay);
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// Round the number of days to the nearest integer because the number of
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// milliseconds in a day is not constant (e.g. it's different in the week of
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// the daylight saving time clock shift).
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return Math.round((laterTimestamp - earlierTimestamp) / millisecondsInDay);
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}
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// Fallback for modularized imports:
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export default differenceInCalendarDays;
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