49 lines
1.2 KiB
TypeScript
49 lines
1.2 KiB
TypeScript
export const ONE_DAY_MILLISECONDS = 1_000 * 60 * 60 * 24
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/**
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* Returns a date as a string value in ISO format (without time information).
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*
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* @param date
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* @returns
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* @example getISODate(new Date("2012-05-23")) // "2012-05-23"
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*/
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export const getISODate = (date: Date): string => {
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return date.toISOString().slice(0, 10)
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}
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export const getNowDateUTC = (): Date => {
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const date = new Date()
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const milliseconds = Date.UTC(
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date.getFullYear(),
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date.getMonth(),
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date.getDate(),
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date.getHours(),
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date.getMinutes(),
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date.getSeconds(),
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)
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return new Date(milliseconds)
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}
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/**
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* Get the week number [1-52] for a given date.
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* @param {Date} date
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* @returns {number}
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* @example getWeekNumber(new Date("2020-01-01")) // 1
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* @example getWeekNumber(new Date("2020-01-08")) // 2
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*/
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export const getWeekNumber = (date: Date): number => {
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const dateCopy = new Date(date.getTime())
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dateCopy.setHours(0, 0, 0, 0)
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dateCopy.setDate(dateCopy.getDate() + 3 - ((dateCopy.getDay() + 6) % 7))
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const week1 = new Date(dateCopy.getFullYear(), 0, 4)
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return (
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1 +
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Math.round(
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((dateCopy.getTime() - week1.getTime()) / ONE_DAY_MILLISECONDS -
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3 +
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((week1.getDay() + 6) % 7)) /
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7,
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)
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)
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}
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