diff --git a/src/duration.ts b/src/duration.ts
index 58492b2..69ddda1 100644
--- a/src/duration.ts
+++ b/src/duration.ts
@@ -128,94 +128,74 @@ export function elapsedTime(date: Date, precision: Unit = 'second', now = Date.n
   )
 }
 
+const durationRoundingThresholds = [
+  Infinity, // Year
+  11, // Month
+  28, // Day
+  21, // Hour
+  55, // Minute
+  55, // Second
+  900, // Millisecond
+]
+
 interface RoundingOpts {
   relativeTo: Date | number
 }
 
 export function roundToSingleUnit(duration: Duration, {relativeTo = Date.now()}: Partial<RoundingOpts> = {}): Duration {
-  relativeTo = new Date(relativeTo)
   if (duration.blank) return duration
-  const sign = duration.sign
-  let years = Math.abs(duration.years)
-  let months = Math.abs(duration.months)
-  let weeks = Math.abs(duration.weeks)
-  let days = Math.abs(duration.days)
-  let hours = Math.abs(duration.hours)
-  let minutes = Math.abs(duration.minutes)
-  let seconds = Math.abs(duration.seconds)
-  let milliseconds = Math.abs(duration.milliseconds)
-
-  if (milliseconds >= 900) seconds += Math.round(milliseconds / 1000)
-  if (seconds || minutes || hours || days || weeks || months || years) {
-    milliseconds = 0
-  }
-
-  if (seconds >= 55) minutes += Math.round(seconds / 60)
-  if (minutes || hours || days || weeks || months || years) seconds = 0
-
-  if (minutes >= 55) hours += Math.round(minutes / 60)
-  if (hours || days || weeks || months || years) minutes = 0
-
-  if (days && hours >= 12) days += Math.round(hours / 24)
-  if (!days && hours >= 21) days += Math.round(hours / 24)
-  if (days || weeks || months || years) hours = 0
-
-  // Resolve calendar dates
-  const currentYear = relativeTo.getFullYear()
-  const currentMonth = relativeTo.getMonth()
-  const currentDate = relativeTo.getDate()
-  if (days >= 27 || years + months + days) {
-    const newMonthDate = new Date(relativeTo)
-    newMonthDate.setDate(1)
-    newMonthDate.setMonth(currentMonth + months * sign + 1)
-    newMonthDate.setDate(0)
-    const monthDateCorrection = Math.max(0, currentDate - newMonthDate.getDate())
-
-    const newDate = new Date(relativeTo)
-    newDate.setFullYear(currentYear + years * sign)
-    newDate.setDate(currentDate - monthDateCorrection)
-    newDate.setMonth(currentMonth + months * sign)
-    newDate.setDate(currentDate - monthDateCorrection + days * sign)
-    const yearDiff = newDate.getFullYear() - relativeTo.getFullYear()
-    const monthDiff = newDate.getMonth() - relativeTo.getMonth()
-    const daysDiff = Math.abs(Math.round((Number(newDate) - Number(relativeTo)) / 86400000)) + monthDateCorrection
-    const monthsDiff = Math.abs(yearDiff * 12 + monthDiff)
-    if (daysDiff < 27) {
-      if (days >= 6) {
-        weeks += Math.round(days / 7)
-        days = 0
+  const referenceDate = new Date(relativeTo)
+  const specifiedDate = applyDuration(referenceDate, duration)
+  const [sign, subtrahend, minuend] =
+    specifiedDate < referenceDate ? [-1, referenceDate, specifiedDate] : [1, specifiedDate, referenceDate]
+  const subtrahendWithoutTime = new Date(subtrahend)
+  subtrahendWithoutTime.setHours(0)
+  subtrahendWithoutTime.setMinutes(0)
+  subtrahendWithoutTime.setSeconds(0)
+  subtrahendWithoutTime.setMilliseconds(0)
+  const minuendWithoutTime = new Date(minuend)
+  minuendWithoutTime.setHours(0)
+  minuendWithoutTime.setMinutes(0)
+  minuendWithoutTime.setSeconds(0)
+  minuendWithoutTime.setMilliseconds(0)
+  if (
+    subtrahendWithoutTime.getTime() === minuendWithoutTime.getTime() ||
+    subtrahend.getTime() - minuend.getTime() < 1000 * 60 * 60 * 12
+  ) {
+    const difference = Math.round((subtrahend.getTime() - minuend.getTime()) / 1000)
+    let hours = Math.floor(difference / 3600)
+    let minutes = Math.floor((difference % 3600) / 60)
+    const seconds = Math.floor(difference % 60)
+    if (hours === 0) {
+      if (seconds >= durationRoundingThresholds[5]) minutes += 1
+      if (minutes >= durationRoundingThresholds[4]) {
+        return new Duration(0, 0, 0, 0, 1 * sign) // 1 hour.
+      }
+      if (minutes === 0) {
+        return new Duration(0, 0, 0, 0, 0, 0, seconds * sign)
       } else {
-        days = daysDiff
+        return new Duration(0, 0, 0, 0, 0, minutes * sign)
       }
-      months = years = 0
-    } else if (monthsDiff <= 11) {
-      months = monthsDiff
-      years = 0
     } else {
-      months = 0
-      years = yearDiff * sign
+      if (hours < 23 && minutes >= durationRoundingThresholds[4]) hours += 1
+      return new Duration(0, 0, 0, 0, hours * sign)
     }
-    if (months || years) days = 0
   }
-  if (years) months = 0
-
-  if (weeks >= 4) months += Math.round(weeks / 4)
-  if (months || years) weeks = 0
-  if (days && weeks && !months && !years) {
-    weeks += Math.round(days / 7)
-    days = 0
+  const days = Math.round((subtrahendWithoutTime.getTime() - minuendWithoutTime.getTime()) / (1000 * 60 * 60 * 24))
+  const months =
+    subtrahend.getFullYear() * 12 + subtrahend.getMonth() - (minuend.getFullYear() * 12 + minuend.getMonth())
+  if (months === 0 || days <= 26) {
+    if (days >= 6) {
+      return new Duration(0, 0, Math.floor((days + 1) / 7) * sign) // Weeks.
+    } else {
+      return new Duration(0, 0, 0, days * sign)
+    }
+  }
+  if (months < 12) {
+    return new Duration(0, months * sign)
+  } else {
+    return new Duration((subtrahend.getFullYear() - minuend.getFullYear()) * sign)
   }
-
-  return new Duration(
-    years * sign,
-    months * sign,
-    weeks * sign,
-    days * sign,
-    hours * sign,
-    minutes * sign,
-    seconds * sign,
-    milliseconds * sign,
-  )
 }
 
 export function getRelativeTimeUnit(
diff --git a/src/relative-time-element.ts b/src/relative-time-element.ts
index 068183d..096dc19 100644
--- a/src/relative-time-element.ts
+++ b/src/relative-time-element.ts
@@ -1,4 +1,4 @@
-import {Duration, elapsedTime, getRelativeTimeUnit, isDuration, roundToSingleUnit, Unit, unitNames} from './duration.js'
+import {Duration, Unit, elapsedTime, getRelativeTimeUnit, isDuration, roundToSingleUnit, unitNames} from './duration.js'
 const HTMLElement = globalThis.HTMLElement || (null as unknown as typeof window['HTMLElement'])
 
 export type DeprecatedFormat = 'auto' | 'micro' | 'elapsed'
@@ -157,6 +157,7 @@ export class RelativeTimeElement extends HTMLElement implements Intl.DateTimeFor
     const tense = this.tense
     let empty = emptyDuration
     if (format === 'micro') {
+      // TODO: Switch to `roundBalancedToSingleUnit` after integrating the new `elapsedTime` implementation.
       duration = roundToSingleUnit(duration)
       empty = microEmptyDuration
       if ((this.tense === 'past' && duration.sign !== -1) || (this.tense === 'future' && duration.sign !== 1)) {
diff --git a/test/duration.ts b/test/duration.ts
index ecb9e68..ef192df 100644
--- a/test/duration.ts
+++ b/test/duration.ts
@@ -241,10 +241,13 @@ suite('duration', function () {
       ['PT1H29M', 'PT1H'],
       ['PT1H31M', 'PT1H'],
       ['PT1H55M', 'PT2H'],
-      ['PT20H', 'PT20H'],
-      ['PT21H', 'P1D'],
-      ['P1DT20H', 'P2D'],
-      ['P1DT18H', 'P2D'],
+      ['PT10H', 'PT10H', {relativeTo: new Date('2023-07-01T20:00:00')}],
+      ['-PT10H', '-PT10H', {relativeTo: new Date('2023-07-01T00:00:00')}],
+      ['PT20H', 'PT20H', {relativeTo: new Date('2023-07-01T00:00:00')}],
+      ['-PT20H', '-PT20H', {relativeTo: new Date('2023-07-01T20:00:00')}],
+      ['PT20H', 'P1D', {relativeTo: new Date('2023-07-01T12:00:00')}],
+      ['-PT20H', '-P1D', {relativeTo: new Date('2023-07-01T12:00:00')}],
+      ['P1DT20H', 'P2D', {relativeTo: new Date('2023-07-01T12:00:00')}],
       ['P4D', 'P4D', {relativeTo: new Date('2023-07-01T00:00:00')}],
       ['-P4D', '-P4D', {relativeTo: new Date('2023-07-01T00:00:00')}],
       ['P6D', 'P1W', {relativeTo: new Date('2023-07-01T00:00:00')}],
@@ -253,18 +256,18 @@ suite('duration', function () {
       ['-P2W', '-P2W', {relativeTo: new Date('2023-07-01T00:00:00')}],
       ['P3W3D', 'P3W', {relativeTo: new Date('2023-07-01T00:00:00')}],
       ['-P3W3D', '-P3W', {relativeTo: new Date('2023-07-01T00:00:00')}],
-      ['P3W6D', 'P1M', {relativeTo: new Date('2023-07-01T00:00:00')}],
+      ['P3W6D', 'P4W', {relativeTo: new Date('2023-07-01T00:00:00')}],
+      ['-P3W6D', '-P4W', {relativeTo: new Date('2023-07-30T00:00:00')}],
+      ['P3W6D', 'P1M', {relativeTo: new Date('2023-07-30T00:00:00')}],
       ['-P3W6D', '-P1M', {relativeTo: new Date('2023-07-01T00:00:00')}],
       ['P21D', 'P3W', {relativeTo: new Date('2023-07-01T00:00:00')}],
       ['-P21D', '-P3W', {relativeTo: new Date('2023-07-01T00:00:00')}],
       ['P24D', 'P3W', {relativeTo: new Date('2023-07-01T00:00:00')}],
       ['-P24D', '-P3W', {relativeTo: new Date('2023-07-01T00:00:00')}],
-      ['P24DT25H', 'P1M', {relativeTo: new Date('2023-07-01T00:00:00')}],
-      ['-P24DT25H', '-P1M', {relativeTo: new Date('2023-07-01T00:00:00')}],
-      ['P25D', 'P1M', {relativeTo: new Date('2023-07-01T00:00:00')}],
-      ['-P25D', '-P1M', {relativeTo: new Date('2023-07-01T00:00:00')}],
-      ['P1M1D', 'P1M', {relativeTo: new Date('2023-07-02T00:00:00')}],
-      ['-P1M1D', '-P1M', {relativeTo: new Date('2023-07-02T00:00:00')}],
+      ['P25DT36H', 'P1M', {relativeTo: new Date('2023-07-15T18:00:00')}],
+      ['-P25DT36H', '-P1M', {relativeTo: new Date('2023-07-15T06:00:00')}],
+      ['P1M1D', 'P1M', {relativeTo: new Date('2023-07-03T00:00:00')}],
+      ['-P1M1D', '-P1M', {relativeTo: new Date('2023-07-03T00:00:00')}],
       ['P1M1D', 'P2M', {relativeTo: new Date('2023-07-31T00:00:00')}],
       ['-P1M1D', '-P2M', {relativeTo: new Date('2023-07-01T00:00:00')}],
       ['P1D', 'P1D', {relativeTo: new Date('2022-01-01T00:00:00Z')}],
@@ -312,8 +315,6 @@ suite('duration', function () {
           relativeTo: new Date('2022-01-01T00:00:00Z'),
         },
       ],
-      ['-P27D', '-P27D', {relativeTo: new Date('2023-02-28T00:00:00Z')}],
-      ['-P27D', '-P1M', {relativeTo: new Date('2023-02-27T00:00:00Z')}],
       ['P1Y2M1D', 'P2Y', {relativeTo: new Date('2022-12-31T12:00:00.000Z')}],
       ['-P1Y8D', '-P1Y', {relativeTo: new Date('2024-01-11T12:00:00.000Z')}],
       ['-P1Y7DT19H43M19S', '-P1Y', {relativeTo: new Date('2024-01-11T12:00:00.000Z')}],
@@ -346,142 +347,149 @@ suite('duration', function () {
       ['PT1H29M', [1, 'hour']],
       ['PT1H31M', [1, 'hour']],
       ['PT1H55M', [2, 'hour']],
-      ['PT20H', [20, 'hour']],
-      ['PT21H', [1, 'day'], {relativeTo: '2023-01-15T00:00:00Z'}],
-      ['-PT21H', [-1, 'day'], {relativeTo: '2023-01-15T00:00:00Z'}],
-      ['P4D', [4, 'day'], {relativeTo: '2023-01-15T00:00:00Z'}],
-      ['-P4D', [-4, 'day'], {relativeTo: '2023-01-15T00:00:00Z'}],
-      ['P6D', [1, 'week'], {relativeTo: '2023-01-15T00:00:00Z'}],
-      ['-P6D', [-1, 'week'], {relativeTo: '2023-01-15T00:00:00Z'}],
-      ['P2W', [2, 'week'], {relativeTo: '2023-01-15T00:00:00Z'}],
-      ['-P2W', [-2, 'week'], {relativeTo: '2023-01-15T00:00:00Z'}],
-      ['P3W3D', [3, 'week'], {relativeTo: '2023-01-15T00:00:00Z'}],
-      ['-P3W3D', [-3, 'week'], {relativeTo: '2023-01-15T00:00:00Z'}],
-      ['P3W6D', [1, 'month'], {relativeTo: '2023-01-15T00:00:00Z'}],
-      ['-P3W6D', [-1, 'month'], {relativeTo: '2023-01-15T00:00:00Z'}],
-      ['P21D', [3, 'week'], {relativeTo: '2023-01-01T00:00:00Z'}],
-      ['-P21D', [-3, 'week'], {relativeTo: '2023-01-01T00:00:00Z'}],
-      ['P24D', [3, 'week'], {relativeTo: '2023-01-01T00:00:00Z'}],
-      ['-P24D', [-3, 'week'], {relativeTo: '2023-01-01T00:00:00Z'}],
-      ['P24DT25H', [1, 'month'], {relativeTo: '2023-01-15T00:00:00Z'}],
-      ['P25D', [1, 'month'], {relativeTo: '2023-01-15T00:00:00Z'}],
-      ['-P35D', [-1, 'month'], {relativeTo: '2023-02-07T22:22:57Z'}],
-      ['-P45D', [-1, 'month'], {relativeTo: '2023-02-17T22:22:57Z'}],
-      ['-P55D', [-1, 'month'], {relativeTo: '2023-02-27T22:22:57Z'}],
-      ['-P65D', [-3, 'month'], {relativeTo: '2023-02-28T22:22:57Z'}],
-      ['-P75D', [-3, 'month'], {relativeTo: '2023-03-09T22:22:57Z'}],
-      ['P1M', [1, 'month'], {relativeTo: '2024-05-31T00:00:00Z'}],
-      ['-P1M', [-1, 'month'], {relativeTo: '2024-05-31T00:00:00Z'}],
-      ['-P3M', [-3, 'month'], {relativeTo: '2023-05-30T00:00:00Z'}],
+      ['PT20H', [20, 'hour'], {relativeTo: '2023-01-15T00:00:00'}],
+      ['-PT20H', [-20, 'hour'], {relativeTo: '2023-01-15T23:00:00'}],
+      ['PT20H', [1, 'day'], {relativeTo: '2023-01-15T12:00:00'}],
+      ['-PT20H', [-1, 'day'], {relativeTo: '2023-01-15T12:00:00'}],
+      ['P4D', [4, 'day'], {relativeTo: '2023-01-15T00:00:00'}],
+      ['-P4D', [-4, 'day'], {relativeTo: '2023-01-15T00:00:00'}],
+      ['P6D', [1, 'week'], {relativeTo: '2023-01-15T00:00:00'}],
+      ['-P6D', [-1, 'week'], {relativeTo: '2023-01-15T00:00:00'}],
+      ['P2W', [2, 'week'], {relativeTo: '2023-01-15T00:00:00'}],
+      ['-P2W', [-2, 'week'], {relativeTo: '2023-01-15T00:00:00'}],
+      ['P3W3D', [3, 'week'], {relativeTo: '2023-01-15T00:00:00'}],
+      ['-P3W3D', [-3, 'week'], {relativeTo: '2023-01-15T00:00:00'}],
+      ['P3W6D', [1, 'month'], {relativeTo: '2023-01-15T00:00:00'}],
+      ['-P3W6D', [-1, 'month'], {relativeTo: '2023-01-15T00:00:00'}],
+      ['P21D', [3, 'week'], {relativeTo: '2023-01-01T00:00:00'}],
+      ['-P21D', [-3, 'week'], {relativeTo: '2023-01-01T00:00:00'}],
+      ['P24D', [3, 'week'], {relativeTo: '2023-01-01T00:00:00'}],
+      ['-P24D', [-3, 'week'], {relativeTo: '2023-01-01T00:00:00'}],
+      ['P25DT36H', [1, 'month'], {relativeTo: '2023-01-15T18:00:00'}],
+      ['P27D', [1, 'month'], {relativeTo: '2023-01-15T00:00:00'}],
+      ['-P35D', [-1, 'month'], {relativeTo: '2023-02-07T22:22:57'}],
+      ['-P45D', [-1, 'month'], {relativeTo: '2023-02-17T22:22:57'}],
+      ['-P55D', [-1, 'month'], {relativeTo: '2023-02-27T22:22:57'}],
+      ['-P65D', [-2, 'month'], {relativeTo: '2023-02-28T22:22:57'}],
+      ['-P75D', [-3, 'month'], {relativeTo: '2023-03-09T22:22:57'}],
+      ['P1M', [1, 'month'], {relativeTo: '2024-08-30T00:00:00'}],
+      ['-P1M', [-1, 'month'], {relativeTo: '2024-08-30T00:00:00'}],
+      ['-P3M', [-3, 'month'], {relativeTo: '2023-08-30T00:00:00'}],
       [
         'P8M',
         [8, 'month'],
         {
-          relativeTo: new Date('2022-01-01T00:00:00Z'),
+          relativeTo: new Date('2022-01-01T00:00:00'),
         },
       ],
       [
         '-P8M',
         [-8, 'month'],
         {
-          relativeTo: new Date('2022-12-01T00:00:00Z'),
+          relativeTo: new Date('2022-12-02T00:00:00'),
         },
       ],
       [
         'P9M',
         [9, 'month'],
         {
-          relativeTo: new Date('2022-01-01T00:00:00Z'),
+          relativeTo: new Date('2022-01-01T00:00:00'),
         },
       ],
       [
         '-P9M',
         [-9, 'month'],
         {
-          relativeTo: new Date('2022-12-01T00:00:00Z'),
+          relativeTo: new Date('2022-12-01T00:00:00'),
         },
       ],
-      ['P1M1D', [1, 'month'], {relativeTo: new Date('2022-12-01T00:00:00Z')}],
-      ['P1M1D', [2, 'month'], {relativeTo: new Date('2023-01-31T00:00:00Z')}],
-      ['P1M30D', [2, 'month'], {relativeTo: new Date('2023-01-31T00:00:00Z')}],
+      ['P1M1D', [1, 'month'], {relativeTo: new Date('2022-12-01T00:00:00')}],
+      ['P1M1D', [2, 'month'], {relativeTo: new Date('2023-01-31T00:00:00')}],
+      ['P1M30D', [2, 'month'], {relativeTo: new Date('2023-01-15T00:00:00')}],
       [
         'P9M20DT25H',
         [9, 'month'],
         {
-          relativeTo: new Date('2022-01-01T00:00:00Z'),
+          relativeTo: new Date('2022-01-01T00:00:00'),
         },
       ],
       [
         '-P9M20DT25H',
         [-10, 'month'],
         {
-          relativeTo: new Date('2022-12-01T00:00:00Z'),
+          relativeTo: new Date('2022-12-01T00:00:00'),
         },
       ],
       [
         'P9M24DT25H',
         [9, 'month'],
         {
-          relativeTo: new Date('2022-01-01T00:00:00Z'),
+          relativeTo: new Date('2022-01-01T00:00:00'),
         },
       ],
       [
         '-P9M24DT25H',
         [-10, 'month'],
         {
-          relativeTo: new Date('2022-12-01T00:00:00Z'),
+          relativeTo: new Date('2022-12-01T00:00:00'),
+        },
+      ],
+      [
+        '-P11M',
+        [-11, 'month'],
+        {
+          relativeTo: new Date('2022-12-02T00:00:00'),
         },
       ],
-      ['P11M', [11, 'month']],
       ['P1Y4D', [1, 'year']],
       [
         'P1Y5M13D',
         [1, 'year'],
         {
-          relativeTo: new Date('2022-01-01T00:00:00Z'),
+          relativeTo: new Date('2022-01-01T00:00:00'),
         },
       ],
       [
         '-P1Y5M13D',
         [-1, 'year'],
         {
-          relativeTo: new Date('2022-12-01T00:00:00Z'),
+          relativeTo: new Date('2022-12-01T00:00:00'),
         },
       ],
       [
         'P1Y5M15D',
         [1, 'year'],
         {
-          relativeTo: new Date('2022-01-01T00:00:00Z'),
+          relativeTo: new Date('2022-01-01T00:00:00'),
         },
       ],
       [
         '-P1Y5M15D',
         [-1, 'year'],
         {
-          relativeTo: new Date('2022-12-01T00:00:00Z'),
+          relativeTo: new Date('2022-12-01T00:00:00'),
         },
       ],
       [
         'P1Y5M20D',
         [2, 'year'],
         {
-          relativeTo: new Date('2022-12-01T00:00:00Z'),
+          relativeTo: new Date('2022-12-01T00:00:00'),
         },
       ],
       [
         '-P1Y5M20D',
         [-2, 'year'],
         {
-          relativeTo: new Date('2022-01-01T00:00:00Z'),
+          relativeTo: new Date('2022-01-01T00:00:00'),
         },
       ],
-      ['P1Y10M', [2, 'year'], {relativeTo: new Date('2022-12-01T00:00:00Z')}],
+      ['P1Y10M', [2, 'year'], {relativeTo: new Date('2022-12-01T00:00:00')}],
       [
         '-P1Y10M',
         [-2, 'year'],
         {
-          relativeTo: new Date('2022-10-01T00:00:00Z'),
+          relativeTo: new Date('2022-10-01T00:00:00'),
         },
       ],
     ])
diff --git a/test/relative-time.js b/test/relative-time.js
index c98a1ae..ef0842a 100644
--- a/test/relative-time.js
+++ b/test/relative-time.js
@@ -450,9 +450,9 @@ suite('relative-time', function () {
       freezeTime(new Date(2033, 1, 1))
       const time = document.createElement('relative-time')
       time.setAttribute('tense', 'past')
-      time.setAttribute('datetime', '2023-01-01T00:00:00Z')
+      time.setAttribute('datetime', '2023-01-01T00:00:00')
       await Promise.resolve()
-      assert.equal(time.shadowRoot.textContent, '11 years ago')
+      assert.equal(time.shadowRoot.textContent, '10 years ago')
     })
 
     test('rewrites from now past datetime to minutes ago', async () => {
@@ -499,7 +499,7 @@ suite('relative-time', function () {
       time.setAttribute('tense', 'past')
       time.setAttribute('datetime', '2023-06-01T00:00:00Z')
       await Promise.resolve()
-      assert.equal(time.shadowRoot.textContent, '4 months ago')
+      assert.equal(time.shadowRoot.textContent, '3 months ago')
     })
 
     test('rewrites from last few days of month to smaller last month', async () => {
@@ -1232,72 +1232,84 @@ suite('relative-time', function () {
 
       // 40 days in the future
       {
-        datetime: '2022-12-03T15:46:00.000Z',
+        reference: '2022-11-03T15:46:00.000Z',
+        datetime: '2022-12-13T15:46:00.000Z',
         tense: 'future',
         format: 'relative',
-        expected: 'in 2 months',
+        expected: 'next month',
       },
       {
-        datetime: '2022-12-03T15:46:00.000Z',
+        reference: '2022-11-03T15:46:00.000Z',
+        datetime: '2022-12-13T15:46:00.000Z',
         tense: 'past',
         format: 'relative',
         expected: 'now',
       },
       {
-        datetime: '2022-12-03T15:46:00.000Z',
+        reference: '2022-11-03T15:46:00.000Z',
+        datetime: '2022-12-13T15:46:00.000Z',
         format: 'relative',
         formatStyle: 'narrow',
-        expected: 'on Dec 3',
+        expected: 'on Dec 13',
       },
       {
-        datetime: '2022-12-03T15:46:00.000Z',
+        reference: '2022-11-03T15:46:00.000Z',
+        datetime: '2022-12-13T15:46:00.000Z',
         format: 'relative',
         precision: 'hour',
-        expected: 'on Dec 3',
+        expected: 'on Dec 13',
       },
       {
-        datetime: '2022-12-03T15:46:00.000Z',
+        reference: '2022-11-03T15:46:00.000Z',
+        datetime: '2022-12-13T15:46:00.000Z',
         format: 'relative',
         threshold: 'PT0S',
-        expected: 'on Dec 3',
+        expected: 'on Dec 13',
       },
       {
-        datetime: '2022-12-03T15:46:00.000Z',
+        reference: '2022-11-03T15:46:00.000Z',
+        datetime: '2022-12-13T15:46:00.000Z',
         format: 'datetime',
-        expected: 'Sat, Dec 3',
+        expected: 'Tue, Dec 13',
       },
       {
-        datetime: '2022-12-03T15:46:00.000Z',
+        reference: '2022-11-03T15:46:00.000Z',
+        datetime: '2022-12-13T15:46:00.000Z',
         format: 'datetime',
         weekday: '',
         month: '',
-        expected: '3',
+        expected: '13',
       },
       {
-        datetime: '2022-12-03T15:46:00.000Z',
+        reference: '2022-11-03T15:46:00.000Z',
+        datetime: '2022-12-13T15:46:00.000Z',
         format: 'duration',
-        expected: '1 month, 10 days, 1 hour',
+        expected: '1 month, 10 days',
       },
       {
-        datetime: '2022-12-03T15:46:00.000Z',
+        reference: '2022-11-03T15:46:00.000Z',
+        datetime: '2022-12-13T15:46:00.000Z',
         format: 'duration',
         precision: 'minute',
-        expected: '1 month, 10 days, 1 hour',
+        expected: '1 month, 10 days',
       },
       {
-        datetime: '2022-12-03T15:46:00.000Z',
+        reference: '2022-11-03T15:46:00.000Z',
+        datetime: '2022-12-13T15:46:00.000Z',
         format: 'duration',
         precision: 'day',
         expected: '1 month, 10 days',
       },
       {
-        datetime: '2022-12-03T15:46:00.000Z',
+        reference: '2022-11-03T15:46:00.000Z',
+        datetime: '2022-12-13T15:46:00.000Z',
         format: 'duration',
         tense: 'future',
-        expected: '1 month, 10 days, 1 hour',
+        expected: '1 month, 10 days',
       },
       {
-        datetime: '2022-12-03T15:46:00.000Z',
+        reference: '2022-11-03T15:46:00.000Z',
+        datetime: '2022-12-13T15:46:00.000Z',
         format: 'duration',
         tense: 'past',
         expected: '0 seconds',
@@ -1349,25 +1361,25 @@ suite('relative-time', function () {
       {
         datetime: '2024-10-24T14:46:00.000Z',
         format: 'duration',
-        expected: '2 years, 11 days',
+        expected: '2 years',
       },
       {
         datetime: '2024-10-24T14:46:00.000Z',
         format: 'duration',
         precision: 'minute',
-        expected: '2 years, 11 days',
+        expected: '2 years',
       },
       {
         datetime: '2024-10-24T14:46:00.000Z',
         format: 'duration',
         precision: 'day',
-        expected: '2 years, 11 days',
+        expected: '2 years',
       },
       {
         datetime: '2024-10-24T14:46:00.000Z',
         format: 'duration',
         tense: 'future',
-        expected: '2 years, 11 days',
+        expected: '2 years',
       },
       {
         datetime: '2024-10-24T14:46:00.000Z',
@@ -1799,19 +1811,19 @@ suite('relative-time', function () {
       {
         datetime: '2020-10-24T14:46:00.000Z',
         format: 'duration',
-        expected: '2 years, 10 days',
+        expected: '2 years',
       },
       {
         datetime: '2020-10-24T14:46:00.000Z',
         format: 'duration',
         precision: 'minute',
-        expected: '2 years, 10 days',
+        expected: '2 years',
       },
       {
         datetime: '2020-10-24T14:46:00.000Z',
         format: 'duration',
         precision: 'day',
-        expected: '2 years, 10 days',
+        expected: '2 years',
       },
       {
         datetime: '2020-10-24T14:46:00.000Z',
@@ -1823,11 +1835,11 @@ suite('relative-time', function () {
         datetime: '2020-10-24T14:46:00.000Z',
         format: 'duration',
         tense: 'past',
-        expected: '2 years, 10 days',
+        expected: '2 years',
       },
       {
         reference: '2023-03-23T12:03:00.000Z',
-        datetime: '2023-03-21T16:03:00.000Z',
+        datetime: '2023-03-21T15:03:00.000Z',
         format: 'relative',
         tense: 'past',
         expected: '2 days ago',
@@ -1977,7 +1989,7 @@ suite('relative-time', function () {
         expected: '2y',
       },
       {
-        datetime: '2024-04-01T14:46:00.000Z',
+        datetime: '2024-09-22T14:46:00.000Z',
         tense: 'future',
         format: 'micro',
         expected: '2y',
@@ -2143,7 +2155,7 @@ suite('relative-time', function () {
       {
         datetime: '2021-10-30T14:46:00.000Z',
         format: 'elapsed',
-        expected: '11m 29d',
+        expected: '11m 24d',
       },
       {
         datetime: '2021-10-30T14:46:00.000Z',
@@ -2154,7 +2166,7 @@ suite('relative-time', function () {
       {
         datetime: '2021-10-29T14:46:00.000Z',
         format: 'elapsed',
-        expected: '1y',
+        expected: '11m 25d',
       },
 
       // Dates in the past
@@ -2481,7 +2493,7 @@ suite('relative-time', function () {
         datetime: '2022-01-01T12:00:00.000Z',
         tense: 'past',
         format: 'micro',
-        expected: '1y',
+        expected: '11m',
       },
       {
         reference: '2022-12-31T12:00:00.000Z',
@@ -2499,7 +2511,7 @@ suite('relative-time', function () {
       },
       {
         reference: '2021-04-24T12:00:00.000Z',
-        datetime: '2023-02-01T12:00:00.000Z',
+        datetime: '2023-03-22T12:00:00.000Z',
         tense: 'future',
         format: 'micro',
         expected: '2y',
@@ -2512,11 +2524,11 @@ suite('relative-time', function () {
         expected: '4 years ago',
       },
       {
-        reference: '2024-12-04T00:00:00.000Z',
+        reference: '2024-11-14T00:00:00.000Z',
         datetime: '2024-01-16T00:00:00.000Z',
         tense: 'past',
         format: 'auto',
-        expected: '11 months ago',
+        expected: '10 months ago',
       },
     ])
 

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