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+import requiredArgs from '../_lib/requiredArgs/index'
+import { Duration } from '../types'
+
+// 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
+const 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)
+}