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x/date_fns/milliseconds/index.ts

date-fns Deno package
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import requiredArgs from '../_lib/requiredArgs/index.ts'import { Duration } from '../types.ts'
// Leap year occures every 4 years, except for years that are divisable by 100 and not divisable by 400.// 1 mean year = (365+1/4-1/100+1/400) days = 365.2425 daysconst daysInYear = 365.2425
/** * @name milliseconds * @category Millisecond Helpers * @summary * Returns the number of milliseconds in the specified, years, months, weeks, days, hours, minutes and seconds. * * @description * Returns the number of milliseconds in the specified, years, months, weeks, days, hours, minutes and seconds. * * One years equals 365.2425 days according to the formula: * * > Leap year occures every 4 years, except for years that are divisable by 100 and not divisable by 400. * > 1 mean year = (365+1/4-1/100+1/400) days = 365.2425 days * * One month is a year divided by 12. * * @param {Duration} duration - the object with years, months, weeks, days, hours, minutes and seconds to be added. Positive decimals will be rounded using `Math.floor`, decimals less than zero will be rounded using `Math.ceil`. * @returns {number} the milliseconds * @throws {TypeError} 1 argument required * * @example * // 1 year in milliseconds * milliseconds({ years: 1 }) * //=> 31556952000 * * // 3 months in milliseconds * milliseconds({ months: 3 }) * //=> 7889238000 */export default function milliseconds({ years, months, weeks, days, hours, minutes, seconds,}: Duration): number { requiredArgs(1, arguments)
let totalDays = 0
if (years) totalDays += years * daysInYear if (months) totalDays += months * (daysInYear / 12) if (weeks) totalDays += weeks * 7 if (days) totalDays += days
let totalSeconds = totalDays * 24 * 60 * 60
if (hours) totalSeconds += hours * 60 * 60 if (minutes) totalSeconds += minutes * 60 if (seconds) totalSeconds += seconds
return Math.round(totalSeconds * 1000)}