DMleadgen
46d973904b
Next.js website for Rocky Mountain Vending company featuring: - Product catalog with Stripe integration - Service areas and parts pages - Admin dashboard with Clerk authentication - SEO optimized pages with JSON-LD structured data Co-authored-by: Cursor <cursoragent@cursor.com>
66 lines
2.4 KiB
Text
66 lines
2.4 KiB
Text
import { getTimezoneOffsetInMilliseconds } from "./_lib/getTimezoneOffsetInMilliseconds.js";
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import { millisecondsInDay } from "./constants.js";
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import { toDate } from "./toDate.js";
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/**
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* @name getOverlappingDaysInIntervals
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* @category Interval Helpers
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* @summary Get the number of days that overlap in two time intervals
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*
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* @description
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* Get the number of days that overlap in two time intervals. It uses the time
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* between dates to calculate the number of days, rounding it up to include
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* partial days.
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*
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* Two equal 0-length intervals will result in 0. Two equal 1ms intervals will
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* result in 1.
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*
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* @param intervalLeft - The first interval to compare.
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* @param intervalRight - The second interval to compare.
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* @param options - An object with options
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*
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* @returns The number of days that overlap in two time intervals
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*
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* @example
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* // For overlapping time intervals adds 1 for each started overlapping day:
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* getOverlappingDaysInIntervals(
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* { start: new Date(2014, 0, 10), end: new Date(2014, 0, 20) },
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* { start: new Date(2014, 0, 17), end: new Date(2014, 0, 21) }
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* )
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* //=> 3
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*
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* @example
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* // For non-overlapping time intervals returns 0:
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* getOverlappingDaysInIntervals(
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* { start: new Date(2014, 0, 10), end: new Date(2014, 0, 20) },
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* { start: new Date(2014, 0, 21), end: new Date(2014, 0, 22) }
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* )
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* //=> 0
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*/
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export function getOverlappingDaysInIntervals(intervalLeft, intervalRight) {
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const [leftStart, leftEnd] = [
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+toDate(intervalLeft.start),
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+toDate(intervalLeft.end),
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].sort((a, b) => a - b);
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const [rightStart, rightEnd] = [
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+toDate(intervalRight.start),
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+toDate(intervalRight.end),
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].sort((a, b) => a - b);
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// Prevent NaN result if intervals don't overlap at all.
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const isOverlapping = leftStart < rightEnd && rightStart < leftEnd;
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if (!isOverlapping) return 0;
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// Remove the timezone offset to negate the DST effect on calculations.
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const overlapLeft = rightStart < leftStart ? leftStart : rightStart;
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const left = overlapLeft - getTimezoneOffsetInMilliseconds(overlapLeft);
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const overlapRight = rightEnd > leftEnd ? leftEnd : rightEnd;
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const right = overlapRight - getTimezoneOffsetInMilliseconds(overlapRight);
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// Ceil the number to include partial days too.
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return Math.ceil((right - left) / millisecondsInDay);
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}
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// Fallback for modularized imports:
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export default getOverlappingDaysInIntervals;
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