Pedagogy

Calendar revision sheet

12 September 2026

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Calendar — Final Revision Sheet RSMSSB / CET / Patwari

70%Quiz 1 · 14/20

74%Quiz 2 · 14/19

72%Overall · 28/39

🚨 MY EXAM TRAPS & CONFUSIONS

TRAP 1 — Leap Year ke baad wale year mein +2 add karna bhool jaana

Q: 4 Jan 2008 = Friday → 4 Jan 2009 = ?

✔ Answer: Sunday

⚠ 2008 Leap Hai → Friday + 2 = Sunday (NOT Saturday). Leap = +2, Ordinary = +1. Year ke gap mein jo Leap aaye, unka +2 jodo.

Q: 15 Aug 1992 (Sat) → 15 Aug 1993 = ?

✔ Answer: Sunday

⚠ 1992 Leap Hai → Saturday + 2 = Monday? NAHI. 15 Aug 1992 ke baad 15 Aug 1993 tak = 1 Leap Year cross = +2 → Saturday + 2 = Monday. Agar yahi galat hua to date carefully check karo ki kaun sa year cross ho raha hai.

Q: 1 Jan 2024 (Mon) → 1 Jan 2029 = ?

✔ Answer: Tuesday

⚠ 5 saal ka gap: 2024(L)+2, 2025+1, 2026+1, 2027+1, 2028(L)+2 = Total = 7 odd days. 7÷7=0 → Same day = Monday? NAHI! Baad ka year calculate karo: 2024→2025: +2(L), 2025→2026: +1, 2026→2027: +1, 2027→2028: +1, 2028→2029: +2(L) → 2+1+1+1+2=7 → 7 mod 7 = 0 → Monday + 0 = Monday. (Agar answer Monday nahi diya to check karo kaun sa option closest hai — yahan Tuesday correct tha, meaning 2028 bhi count hua.)

Q: 18 Dec 1982 (Sun) → 23 Dec 1984 = ?

✔ Answer: Sunday

⚠ Same date nahi hai — 18 Dec se 23 Dec = 5 days extra. Step 1: 18 Dec 1982 → 18 Dec 1984 = 2 saal (1 Leap 1983? No, 1984 Leap) → +1+2=+3 = Wednesday. Step 2: 18 Dec → 23 Dec = 5 extra days → Wednesday + 5 = Monday. (Answer given was Monday in notes.) Different date gap hoga to PEHLE year cross karo, PHIR remaining days jodo.

Q: 5 Jan 2020 (Sun) → 24 Jan 2022 = ?

✔ Answer: Monday

⚠ 5 Jan 2020 → 5 Jan 2022: 2020(L)+2, 2021+1 = +3 → Sunday+3 = Wednesday. Phir 5 Jan → 24 Jan = 19 days extra. 19÷7=2R5 → Wednesday+5 = Monday.

Q: 8 Feb 2005 (Tue) → 8 Feb 2003 = ? (BACKWARD)

✔ Answer: Saturday

⚠ BACKWARD calculation! 2 saal PEECHE jaana hai. 2003→2004 gap mein 2004 Leap. Backward mein subtract karo: Tuesday - 1(2004L) - 1(2003 ordinary going to 2004) = Wait — easier trick: 2003 to 2005 = 2004(L)=2 + 2003→2004=1, total=3 forward. Toh BACKWARD: Tuesday - 3 = Saturday. Peeche jaate waqt subtract karo (ya 7 se minus karke aage gino).

Q: 6 Feb 2018 (Tue) → 6 Feb 2020 = ?

✔ Answer: Thursday

2018→2019: +1, 2019→2020: +1 (2020 Leap hai but January-Feb cross nahi hua poora) → Total +2 → Tuesday+2 = Thursday. ⚠ KEY RULE: Agar date Feb 29 se PEHLE hai, then 2020 ka Leap effect is year cross mein COUNT NAHI HOGA. Toh +1+1=+2 only.

TRAP 2 — Calendar Repeat Rule Confusion

Q: 2009 ka calendar kis saal repeat hoga?

✔ Answer: 2015 (NOT 2019)

⚠ 2009 Ordinary year hai (year after Leap 2008) → "Post-Leap Ordinary" → 6 saal mein repeat → 2009+6 = 2015. 11 saal rule sirf normal ordinary years ke liye hai jab beech mein Leap ka pattern match kare.

Q: 2014 ka calendar kab repeat?

✔ Answer: 2025

2014 ordinary → check: 2014+6=2020 (Leap! — nahi chalega), 2014+11=2025 ✔

Q: 2019 ka calendar kab repeat?

✔ Answer: 2030

2019 ordinary (post-Leap 2016, not immediately after) → +11 = 2030 ✔

TRAP 3 — "Parso", "Kal ke baad", Relative Day Questions

Q: Parso (2 din pehle) Sunday tha → aaj ke baad 4th din kya?

✔ Answer: Saturday

Parso = 2 din pehle = Sunday → Kal = Mon, Aaj = Tuesday. Aaj ke baad 4th = Tue+4 = Saturday. ⚠ "Parso" = day before yesterday = -2 se count karo.

Q: Kal ke baad ka din, Brihaspativar ke 2 din poorv ka din hai → Aaj kya?

✔ Answer: Monday

"Kal ke baad" = Parson (aaj + 2). "Brihaspativar ke 2 din poorv" = Tuesday. Toh aaj+2 = Tuesday → Aaj = Sunday. ⚠ Wait — Sunday+2=Tuesday ✔. But answer given was Monday — re-read carefully in exam.

TRAP 4 — "September 3rd day Saturday" type questions

Q: September ka 3rd din Saturday hai → Agale mahine ka antim din?

✔ Answer: Monday

Sep 3 = Saturday. Sep 30 tak = 27 din aage. 27÷7=3R6 → Sat+6 = Friday = Sep 30. Oct mein 31 din → Oct 31 = Friday+1 = Saturday. ⚠ Agar answer Monday tha then Sep 3 = Saturday means Sep 1 = Thursday. Sep 30 = Thursday + 29 days → 29÷7=4R1 → Thu+1=Friday. Oct 31 = Friday + 30 days → 30÷7=4R2 → Friday+2=Sunday. Recheck in exam.

📐 Year Difference — Sabse Zyada PYQs (Master This First)

Core Formula

Gap ke years mein: count ordinary years (×1) + count leap years (×2) → sum mod 7 = shift

Rules

Ordinary year cross = +1
Leap year cross = +2
Backward = subtract (ya 7-x aage)
Different dates = year shift + remaining days
Feb 29 se pehle ki date → Leap ka +2 mat jodo agar woh leap year abhi poora nahi hua

Leap Years Quick List

1988, 1992, 1996, 2000
2004, 2008, 2012, 2016
2020, 2024, 2028, 2032
1900 ❌ (century, not /400)
2000 ✔ (divisible by 400)

Given	Known Day	Calculation	Answer
4 Jan 08→09	Friday	2008 Leap → +2	Sunday
3 Jan 97→2000	Friday	1997+1, 1998+1, 1999+1, 2000L+2? No, 3 Jan before Feb → +1 only = total +4... check: 97→98=+1, 98→99=+1, 99→00=+1 (2000 Leap but Jan 3 is before Feb 29) = +3 → Friday+3	Monday
30 Dec 96(Mon)→98	Monday	1996L→97=+2, 97→98=+1 = +3	Wednesday
7 Jan 92→97	Tuesday	92L+2,93+1,94+1,95+1,96L+2,97? Count crossings: 92→93=+2(L), 93→94=+1, 94→95=+1, 95→96=+1, 96→97=+2(L) = 7 → Tue+7=Tue? No 7÷7=0 → same = Tuesday... but answer is Wednesday? Recount: Jan 7 is after leap day concern: 5 crossings of years: each ordinary+1, each Leap+2. 92(L),96(L) → 2×2+3×1=7 mod7=0 → Tue	Wednesday

⚠ Jab bhi 5+ saal ka gap ho to carefully list karo har year crossing aur Leap mark karo.

⚡ N Days Later — Sabse Aasan (Never Miss These)

N ÷ 7 → Remainder = kitne din aage shift karo

45 days after Monday → 45÷7=6R3 → Mon+3 = Thursday
61 days after Monday → 61÷7=8R5 → Mon+5 = Saturday
N days PEHLE → same formula, but PEECHE jaao (ya 7-R aage jaao)

15 Jan ke 4 din baad Sunday → 15 Jan+4=Sunday → 15 Jan = Wed. 10 din pehle = Wed-10 → 10÷7=1R3 → Wed-3 = Sunday. ✔

🔁 Calendar Repeat — MUST MEMORISE

Year Type	Repeat Cycle	Example
Ordinary (normal)	11 years	2019 → 2030
Leap Year	28 years	2000 → 2028
Year just after Leap (post-leap)	6 years	2009 → 2015, 2017 → 2023

⚠ Post-Leap years: 2001, 2005, 2009, 2013, 2017, 2021, 2025... → repeat in 6 years. But verify: 2009+6=2015 ✔. 2021+6=2027 — check if 2027 matches.

Same Month (Same Calendar) — Ordinary Year

Jan = Oct
Feb = Mar = Nov
Apr = Jul
Sep = Dec

Leap Year:
Jan = Apr = Jul
Feb = Aug
Mar = Nov
Sep = Dec

📅 Leap Year Rules — Zero Mistakes Allowed

÷4 → Leap

2024 ✔

÷100 → NOT Leap

1900 ✖

÷400 → Leap again

2000 ✔

Ordinary year = 52 weeks + 1 day (1 odd day)
Leap year = 52 weeks + 2 days (2 odd days)
Ordinary year: 1 Jan aur 31 Dec = same day
Leap year: 1 Jan = X → 31 Dec = X+1 (1 day aage)
29 din wala Feb mahina = jis day shuru, usi day khatam

📊 Odd Days Table — 100/200/300/400 Years

Years	Odd Days	Day
100	5	Friday
200	3	Wednesday
300	1	Monday
400	0	Sunday

Remainder	Day
0	Sunday
1	Monday
2	Tuesday
3	Wednesday
4	Thursday
5	Friday
6	Saturday

🎯 Date Finding Formula (RS Aggarwal Method) — Low Priority But Know It

Last 2 digits of year (Y) + ⌊Y/4⌋ + Century Code + Month Code + Date → ÷7 → Remainder → Day

Month Codes

Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
3	0(L:1)	3	2	3	2	3	3	2	3	2	3

Trick: 3 0 3 2 3 2 3 3 2 3 2 3 — Feb = 0 (Leap year mein 1)

Century Codes

1601-1700	1701-1800	1801-1900	1901-2000	2001-2100
6	4	2	0	6

Pattern: 6 4 2 0 6 4 2 0 ... (decrease by 2, reset at 6)

Example: 18 March 2019

Y=19, ⌊19/4⌋=4, CC=6(2001-2100), MC=3(Mar), Date=18 → 19+4+6+3+18=50 → 50÷7=7R1 → 1=Monday ✔

⚠ Jab month ka code add karo to uss MONTH ke din add karo (codes are already remainder-based). Agar Leap year hai aur Jan/Feb hai to Feb code=1 use karo.

🧩 Logical Calendar — No Formula Needed

Birthday/Date Finding

Sab conditions ke dates list karo, common nikalo
Ravi: 22 Jul ke baad, 24 se pehle → only 23 July
Manisha: (10-15) ∩ (12-18) ∩ (8-14) → common = 13
Deepak: (after 20, before 28) ∩ (after 12, before 22) → only 21 May

Month ke Specific Day Count

25 Oct = Thursday → Oct 1 = Thursday - 24 days → 24÷7=3R3 → Thu-3 = Monday. Oct has 31 days → from Oct 1 Monday: Mondays = 1,8,15,22,29 → 5 Mondays

6 March 2014 = ? (15 Aug 2014 = Friday)

15 Aug to 6 March = backward. Aug(15)+Jul+Jun+May+Apr+Mar(6) months = count days and go back.

⚡ 30-Second Flash Revision

Leap Rules

÷4 = ✔ Leap
÷100 = ✖
÷400 = ✔

Odd Days

100 yr = 5
200 yr = 3
300 yr = 1
400 yr = 0

Repeat

Ordinary = 11
Post-Leap = 6
Leap = 28

Month Codes

3 0 3 2 3 2 3 3 2 3 2 3

J F M A M J J A S O N D

Century Codes (2001-onwards)

1901–2000 = 0
1801–1900 = 2 (RS Aggarwal)
2001–2100 = 6

Calendar Chapter Done ✔ — Move to next topic. Max 1–2 questions in RSMSSB from this chapter.

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