--- title: The date line and summer time: clocks going forward and back — how Mova does on the tests · World description: Lesson 121 of the world course of Mova's primary school: 5 of 12 tests right, exam 0 of 4, every question with the options, the student's choice, the right answer and why it chose. --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/school-run/world/121-date-line-and-summer-time/) [home](https://md.mova.elamur.ai/free/en/) / [at school](https://md.mova.elamur.ai/free/en/school-run/) / [World](https://md.mova.elamur.ai/free/en/school-run/world/) / 121 # The date line and summer time: clocks going forward and back **Tests:** 5 of 12 right · **Exam:** 0 of 4 right · **Kind:** ★★ · **Understood:** 6 of 16 · **Run:** 2026-10-18, commit `f3c23ea72` Lesson 121 of the world course of Mova's primary school, as Mova's small model took its tests: it had read this lesson and the ones before it and learned from their exercises. Each test shows the options in the order the student saw them, its choice, the right answer, the score of every option and why it chose. The lesson itself, sentence by sentence with trees and pragmatics: [the lesson in the corpora](https://md.mova.elamur.ai/free/en/corpora/school/world/121-date-line-and-summer-time/). Every question of this lesson and each of its options parsed by Mova, with trees and pragmatics: [the lesson's questions in the corpora](https://md.mova.elamur.ai/free/en/corpora/questions/world/121-date-line-and-summer-time/). ### Test 1 · ★★ · right ✓ {#t1} Mia: "First New Year's in London, obviously, it's the capital of time." Dad: "Nah." Who's right? - **1.** Dad: places just west of the date line, like Kiritimati, see it first — **← Mova's choice** · **✓ the right answer** · no support - **2.** Mia: London always sees New Year first — no support - **3.** Mia: Greenwich decides when New Year begins for everyone in the whole world — no support - **4.** Dad: New York sees it first — no support **Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/121-date-line-and-summer-time/t1/) ### Test 2 · ★★ · wrong ✗ {#t2} Leo: "Samoa and American Samoa, 100 km apart, different days? That's mental." ("Mental" means crazy.) Why is it so? - **1.** One of them uses a Moon calendar — **← Mova's choice** · no support - **2.** Samoa has no calendar at all — no support - **3.** The date line runs between them — **✓ the right answer** · no support - **4.** American Samoa is a year behind — no support **Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/121-date-line-and-summer-time/t2/) ### Test 3 · ★★ · wrong ✗ {#t3} Ruby flies east from Japan to Hawaii on her birthday: "Birthday twice?? Double cake, slay!" ("Slay" means brilliant.) What's true? - **1.** She gets two years older on one flight — **← Mova's choice** · no support - **2.** The date repeats, but she doesn't get any older — **✓ the right answer** · no support - **3.** She becomes a day younger forever — no support - **4.** She loses her birthday completely — no support **Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/121-date-line-and-summer-time/t3/) ### Test 4 · ★★ · wrong ✗ {#t4} Jack, on the last Sunday of March: "Phone says 9, kitchen clock says 8. Did I sleep through an hour or what?" - **1.** He really did sleep through an extra hour while the clock stopped — score 2 - **2.** His phone is broken and has been running an hour fast all night — no support - **3.** The clocks went forward; the kitchen clock wasn't changed — **✓ the right answer** · score 3 - **4.** The kitchen clock went back an hour by itself in the night — **← Mova's choice** · score 6 **Why:** It took the question to ask which statement is true. It chose option 4 with score 6, against 3 for the next best. Its support: lesson 113, line 15: «In the UK the clocks go back one hour on the last Sunday of October, which in 2026 is 25 October; it brings darker afternoons, but winter as weather scientists…», reached through the option's own match among the sentences about the question's things. What matched: the same action «go back» (+2); the same circumstance (+2); the same doer «clocks» (+1); the same property (+1). The right option, 3, scored 3. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/121-date-line-and-summer-time/t4/) ### Test 5 · ★★ · wrong ✗ {#t5} Hannah, in England: "Spring forward, fall back? We say autumn, ya numpty." ("Numpty" is Scottish for a silly person.) Does the trick still work? - **1.** No: Britain doesn't change its clocks — **← Mova's choice** · no support - **2.** Yes: clocks go forward in spring and back in autumn — **✓ the right answer** · no support - **3.** Yes, but only in America — no support - **4.** No: in Britain the clocks go back in spring — no support **Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/121-date-line-and-summer-time/t5/) ### Test 6 · ★★ · wrong ✗ {#t6} Kai: "Stayin' up for the extra hour, best night of the year, bro." Which night is that? - **1.** The longest night in December — **← Mova's choice** · no support - **2.** The night in late October when the clocks go back — **✓ the right answer** · no support - **3.** New Year's Eve — no support - **4.** The night in late March when the clocks go forward — no support **Why:** Nothing it remembers matched the question, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/121-date-line-and-summer-time/t6/) ### Test 7 · ★★ · wrong ✗ {#t7} Charlotte in Arizona: "Sometimes we got the same time as my cousin in California, sometimes we don't, y'all." Why? - **1.** Arizona and California are in different countries — **← Mova's choice** · no support - **2.** California changes its clocks every month — no support - **3.** Arizona uses the Moon to tell the time — no support - **4.** Arizona doesn't change its clocks, but California does — **✓ the right answer** · no support **Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/121-date-line-and-summer-time/t7/) ### Test 8 · ★★ · wrong ✗ {#t8} Liam's teacher: "A builder came up with summer time." Liam: "Bricks and clocks? Sus." ("Sus" means suspicious.) What's true? - **1.** Samoa came up with it in 2011, on the day it skipped a whole Friday — **← Mova's choice** · no support - **2.** Julius Caesar came up with it in 46 BC, along with the leap year — no support - **3.** William Willett pushed for it in 1907; Britain began it in 1916 — **✓ the right answer** · no support - **4.** A builder made the very first clock in 1907 and called it summer time — no support **Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/121-date-line-and-summer-time/t8/) ### Test 9 · ★★ · right ✓ {#t9} Sam's dad in mid-March: "Bloody New York's changed their clocks before us again." What has happened? - **1.** New York has moved itself into a different time zone for good, an hour nearer London — score 3 - **2.** New York gave up summer time — no support - **3.** Britain moved its clocks back in March — score 1 - **4.** The USA moved its clocks forward on the second Sunday of March, before Britain — **← Mova's choice** · **✓ the right answer** · score 14 **Why:** It took the question to ask which statement is true. It chose option 4 with score 14, against 3 for the next best. Its support: lesson 121, line 15: «The USA moves its clocks forward on the second Sunday of March, so for 2 or 3 weeks New York is 4 hours behind London, not 5.», reached through the remembered sentence the question matched. What matched: the same action «move» (+4); the same place «second sunday» (+4); the same property (+3); the same thing acted on «clocks» (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/121-date-line-and-summer-time/t9/) ### Test 10 · ★★ · right ✓ {#t10} Nan, about her oven clock: "I just add an hour in me head, love." In July the oven says 2:00. What's the real time? - **1.** 3:00 — **← Mova's choice** · **✓ the right answer** · no support - **2.** 4:00 — no support - **3.** 1:00 — no support - **4.** 2:00 — no support **Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/121-date-line-and-summer-time/t10/) ### Test 11 · ★★ · right ✓ {#t11} What would happen if Britain kept summer time all winter long? - **1.** Winter mornings would be darker, with sunrise later by the clock — **← Mova's choice** · **✓ the right answer** · score 3 - **2.** The Sun would rise an hour earlier by the clock — score 2 - **3.** Nothing at all, since clocks don't affect anything — no support - **4.** Winter days would become an hour longer — no support **Why:** It took the question to ask what happens next. It chose option 1 with score 3, against 2 for the next best. Its support: lesson 98, line 4: «To mark a place on a map, sailors needed its latitude (how far north or south) and its longitude (how far east or west). Latitude was found from the height of…», reached through what followed the sentence the question matched. What matched: the same circumstance (+4). Against it: a different doer (counts against) (-1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/121-date-line-and-summer-time/t11/) ### Test 12 · ★★ · right ✓ {#t12} A film shows a hero crossing the date line going west at 11 pm on Monday. What date is it on the other side? - **1.** The next Monday, a whole week later on the calendar — score 5 - **2.** Still Monday, because dates never change out at sea — no support - **3.** Sunday, because going west the date always goes back — score 5 - **4.** Tuesday, because going west the date jumps forward — **← Mova's choice** · **✓ the right answer** · score 7 **Why:** It took the question to ask what it is done to. It chose option 4 with score 7, against 5 for the next best. Its support: lesson 121, line 1: «Somewhere the date has to change, or a traveller going east round the world would keep adding hours forever. That place is the International Date Line, which r…», reached through the option's own match among the sentences about the question's things. What matched: the same action «jump» (+6); the same property (+1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/121-date-line-and-summer-time/t12/) ### Exam question 1 · formal language · wrong ✗ {#e1} Select the response consistent with the established facts concerning the crossing of the International Date Line in an easterly direction. - **1.** The clock alone is set back by one hour — no support - **2.** The date is advanced by one day — **← Mova's choice** · score 0 - **3.** The date is set back by one day — **✓ the right answer** · score 0 - **4.** Neither date nor clock is altered — no support **Why:** It took the question to ask which statement is true. It chose option 2 with score 0, tied with another option at 0 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 108, line 15: «For two dates in the same month, take the smaller date from the bigger: 16 − 2 = 14 days.», reached through the option's own match among the sentences about the question's things. What matched: the same property (+1). Against it: a different action (counts against) (-1). The right option, 3, scored 0. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/121-date-line-and-summer-time/e1/) ### Exam question 2 · formal language · wrong ✗ {#e2} Given that Kiritimati is fourteen hours ahead of London, ascertain the time in London at the moment Kiritimati attains midnight commencing the first of January. - **1.** Midnight of the thirty-first of December — **← Mova's choice** · no support - **2.** Two o'clock in the afternoon of the first of January — no support - **3.** Ten o'clock in the morning of the thirty-first of December — **✓ the right answer** · no support - **4.** Ten o'clock in the evening of the thirty-first of December — no support **Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/121-date-line-and-summer-time/e2/) ### Exam question 3 · formal language · wrong ✗ {#e3} Identify the duration of the night upon which British clocks are put back by one hour in October. - **1.** Twenty-six hours — **← Mova's choice** · no support - **2.** Twenty-three hours — no support - **3.** Twenty-five hours — **✓ the right answer** · no support - **4.** Twenty-four hours — no support **Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/121-date-line-and-summer-time/e3/) ### Exam question 4 · formal language · wrong ✗ {#e4} Which of the following statements most accurately characterises the origin of summer time in Britain? - **1.** It was decreed by Pope Gregory the Thirteenth for all Christendom in 1582 — **← Mova's choice** · score 7 - **2.** It was devised in 1884 at the International Meridian Conference in Washington — no support - **3.** It was advocated from 1907 by William Willett and adopted in 1916 — **✓ the right answer** · no support - **4.** It was adopted in 1752 together with the Gregorian calendar in Britain — score 0 **Why:** It took the question to ask who or what does it. It chose option 1 with score 7, against 0 for the next best. Its support: lesson 116, line 12: «In 1582 Pope Gregory XIII brought in the Gregorian calendar: Thursday 4 October was followed by Friday 15 October, skipping 10 dates.», reached through a sentence linked to the one the question matched. What matched: the same place «1582» (+3); it fills the role the question asks for (+3); the same doer «pope gregory» (+2). Against it: a different action (counts against) (-1). The right option, 3, found no support in what it remembers. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/121-date-line-and-summer-time/e4/) - ← previous: [120. Time zones: why it's night in Sydney when it's d…](https://md.mova.elamur.ai/free/en/school-run/world/120-time-zones/) - next →: [122. Clocks before clocks: sundials, water clocks, ca…](https://md.mova.elamur.ai/free/en/school-run/world/122-clocks-before-clocks/) - ↑ back to [World](https://md.mova.elamur.ai/free/en/school-run/world/)