Calendar Tricks for RRB NTPC, Section Controller & Group D
Calendar Master Notes
सभी Tricks एक ही जगह
Date → Day निकालना
144025036146 Trick
हम Sunday = 1 वाला system use करेंगे.
| Month | Normal Year | Leap Year* |
|---|---|---|
| January | 1 | 0 |
| February | 4 | 3 |
| March | 4 | 4 |
| April | 0 | 0 |
| May | 2 | 2 |
| June | 5 | 5 |
| July | 0 | 0 |
| August | 3 | 3 |
| September | 6 | 6 |
| October | 1 | 1 |
| November | 4 | 4 |
| December | 6 | 6 |
याद करने की line:
- Normal: 1 4 4 0 2 5 0 3 6 1 4 6
- Leap year में सिर्फ Jan/Feb बदलेंगे: 0 3 4 0 2 5 0 3 6 1 4 6
Day Number / Remainder Table
| Remainder | Day |
|---|---|
| 1 | Sunday |
| 2 | Monday |
| 3 | Tuesday |
| 4 | Wednesday |
| 5 | Thursday |
| 6 | Friday |
| 0 / 7 | Saturday |
Formula: Date + Month Code + Year Code + Century Code फिर: Total ÷ 7 → Remainder → Day
Year Code
Year के last two digits लो.
Formula: Year Code = Last 2 digits + ⌊Last 2 digits ÷ 4⌋
| Year | Calculation | Year Code |
|---|---|---|
| 1947 | 47 + 11 | 58 |
| 1950 | 50 + 12 | 62 |
| 2024 | 24 + 6 | 30 |
| 2026 | 26 + 6 | 32 |
Century Code
| Century | Code |
|---|---|
| 1600 | 6 |
| 1700 | 4 |
| 1800 | 2 |
| 1900 | 0 |
| 2000 | 6 |
| 2100 | 4 |
| 2200 | 2 |
| 2300 | 0 |
Memory Trick: 6 → 4 → 2 → 0 → Repeat
Leap Year Rule
4 से divisible → Leap लेकिन century year में: 400 से divisible होना जरूरी है.
| Year | Leap? |
|---|---|
| 1996 | ✅ |
| 1900 | ❌ |
| 2000 | ✅ |
| 2024 | ✅ |
| 2100 | ❌ |
| 2400 | ✅ |
Super Trick: 100/200/300 = NOT Leap, 400 = Leap
Leap Year में Month Code
सिर्फ January और February के codes 1 कम होंगे.
- Normal: 1 4 4 0 2 5 0 3 6 1 4 6
- Leap Jan/Feb: 0 3 4 0 2 5 0 3 6 1 4 6
Important
March–December के लिए leap year होने पर code नहीं बदलता.
Calendar Repeat Trick
Calendar repeat होने के लिए: Total Odd Days % 7 = 0
Odd Days
| Year | Odd Days |
|---|---|
| Normal year | 1 |
| Leap year | 2 |
Repeat-Year Shortcut
Year को 4 से divide करो और remainder देखो:
| Remainder | Common Repeat Gap |
|---|---|
| 1 | 6 years |
| 2 | 11 years |
| 3 | 11 years |
| 0 | 28 years |
Examples:
- 2017 ÷ 4 → remainder 1 → 6-year type
- 2022 ÷ 4 → remainder 2 → 11-year type
- 2023 ÷ 4 → remainder 3 → 11-year type
- 2096 ÷ 4 → remainder 0 → 28-year type
सबसे जरूरी warning
यह shortcut blindly नहीं लगाना.
अगर बीच में:
- Leap year
- Century year
- 2100 / 2200 / 2300
जैसा case आता है, तो Odd Days से verify करना है.
Odd Days की Master Trick
100 Years
- 100 years = 5 odd days
200 Years
- 200 years = 3 odd days
300 Years
- 300 years = 1 odd day
400 Years
- 400 years = 0 odd days
याद करने की line: 5 → 3 → 1 → 0 और फिर repeat.
Month में 5 बार कोई Day कब आएगा?
| Month Days | 5 times आने वाले Days |
|---|---|
| 28 days | कोई भी नहीं |
| 29 days | Starting day |
| 30 days | Starting day + next day |
| 31 days | Starting day + next 2 days |
Example: 31-day month starts Friday. Extra 3 days: Friday, Saturday, Sunday इसलिए ये तीनों 5 बार आएंगे.
Date Difference Trick
अगर पूछा: Monday के 100 days बाद कौन सा day?
- बस: 100 ÷ 7
- Remainder = 2
- Monday + 2:
- Tuesday → Wednesday
Shortcut: Days को 7 से divide → remainder → उतने days आगे.
Century का Golden Rule
सबसे important: Century year तभी Leap होगा जब 400 से divisible हो. इसलिए:
- 1900 ❌
- 2000 ✅
- 2100 ❌
- 2200 ❌
- 2300 ❌
- 2400 ✅
CALENDAR DECISION TABLE
Question देखकर सीधे यह decide करो:
| Question में क्या पूछा? | कौन सी Trick? |
|---|---|
| Date का day | 144025036 + Formula |
| Jan/Feb + leap year | −1 / Leap Codes |
| 100/200/300 years | 5-3-1-0 |
| Calendar कब repeat? | Repeat/ Odd Days |
| 6/11/28 years | Remainder shortcut + Verify |
| 5 Sundays/Mondays | 29/30/31-day rule |
| 100/500 days बाद | ÷7 remainder |
| 1900/2000/2100 | 400-divisibility rule |
| Same calendar | Odd Days = multiple of 7 |
| Mixed tough question | Leap + Odd Days + Century |
1. 15 August 1947 को कौन-सा दिन था?
A) Thursday
B) Friday
C) Saturday
D) Sunday
- Step 1: Date = 15
- Step 2: August code = 3
- Step 3: Year code: 47 + ⌊47/4⌋ = 47 + 11 = 58
- Step 4: Century code: 1900 → 0
- Step 5: Total: 15 + 3 + 58 + 0 = 76 → 76 ÷ 7 → remainder 6
6 = Friday
2. 14 November 1989 को कौन-सा दिन था?
A) Tuesday
B) Wednesday
C) Thursday
D) Monday
- Date = 14
- November code = 4
- Year code: 89 + ⌊89/4⌋ = 89 + 22 = 111
- Century = 0
- Total: 14 + 4 + 111 = 129
- 129 ÷ 7 → remainder 3
- 3 = Tuesday
3. 29 February 2024 ko kaunsa day tha?
A) Tuesday
B) Wednesday
C) Thursday
D) Monday
- 2024 leap year hai.
- Date = 29
- Leap-year February code = 3
- Year code: 24 + ⌊24/4⌋ = 24 + 6 = 30
- Century code (2000) = 6
- Total: 29 + 3 + 30 + 6 = 68
- 68 ÷ 7 → remainder 5
- Sunday = 1 system:
5 = Thursday
4. अगर 1 January 2024 = Monday, तो 31 December 2024 कौन-सा day होगा?
A) Thursday
B) Friday
C) Saturday
D) Sunday
- 2024 leap year है.
- Total days = 366
- लेकिन 1 Jan से 31 Dec तक difference: 365 days
- 365 ÷ 7 → remainder 1
- Monday + 1 = Tuesday
Answer: Tuesday
Trick
- Same year में last date निकालते समय:
- 365 days → +1
- Leap year में भी 1 Jan → 31 Dec = 365-day difference होता है.
5. एक 31-day month Sunday से शुरू होता है. उस month में कितने Sundays होंगे?
- 31 days: 28 days = 4 complete weeks
- Remaining = 3 days
- Starting day = Sunday.
- Extra days: Sunday, Monday, Tuesday
- इसलिए Sunday 5 बार आएगा.
Answer: 5 Sundays
Shortcut: 31 days → starting day + next 2 days = 5 times
6. अगर 1 January 1900 = Monday, तो 1 January 2000 कौन-सा day होगा?
- 1900 → 2000 = 100 years
- 1900 leap year नहीं था.
- 1904 से 1996 तक leap years:
- 24 leap years
- Normal years: 100 − 24 = 76
- Odd days: 76 × 1 + 24 × 2 = 76 + 48 = 124
- 124 ÷ 7 → remainder 5
- Monday + 5:
- Tuesday → Wednesday → Thursday → Friday → Saturday
Answer: Saturday
7. 1900 और 2000 में से कौन-सा leap year है?
A) Only 1900
B) Only 2000
C) Both
D) Neither
- Century year तभी leap होता है जब वह 400 से divisible हो.
- 1900 ÷ 400 → not divisible
- 2000 ÷ 400 → divisible
Answer: B) Only 2000
8. 2017 का calendar किस वर्ष में फिर से repeat होगा?
A) 2022
B) 2023
C) 2024
D) 2025
2017 → 2023 = 6 years
इस period में:
- 5 normal years = 5 odd days
- 2020 leap year = 2 odd days
- Total: 5 + 2 = 7 odd days
- 7 = complete week. Therefore calendar repeats.
Answer: B) 2023
9. 2018 का calendar किस वर्ष में repeat होगा?
A) 2028
B) 2029
C) 2030
D) 2031
- 2018 → 2029 = 11 years
- Leap years: 2020, 2024, 2028 = 3
- Normal years = 8
- Odd days: 8 × 1 + 3 × 2 = 14
- 14 is divisible by 7.
Answer: B) 2029
10. यदि 1 January 2000 Saturday था, तो 1 January 2100 कौन-सा दिन था?
A) Friday
B) Saturday
C) Sunday
D) Monday
- 2000 → 2100 = 100 years.
- 2000 leap year है.
- इस interval में leap years = 25
- Normal years = 75
- Odd days: 75 × 1 + 25 × 2 = 75 + 50 = 125
- 125 ÷ 7 → remainder 6
- Saturday + 6 = Friday
11. यदि आज Monday है, तो 500 दिन बाद कौन-सा दिन होगा?
A) Tuesday
B) Wednesday
C) Thursday
D) Friday
- 500 ÷ 7
- Remainder = 3
- Monday + 3:
- Tuesday → Wednesday → Thursday
12. यदि 1 January 2021 Friday था, तो 1 January 2022 कौन-सा दिन था?
A) Friday
B) Saturday
C) Sunday
D) Monday
- 2021 normal year है.
- Normal year = 1 odd day
- Friday + 1 = Saturday
13. यदि 1 March 2020 Sunday था, तो 1 March 2021 कौन-सा दिन था?
A) Monday
B) Tuesday
C) Wednesday
D) Sunday
- 2020 leap year है, इसलिए 1 March 2020 → 1 March 2021 के बीच 366 days होंगे.
- 366 ÷ 7 → remainder 2
- Sunday + 2 = Tuesday
14. यदि 15 August 2023 Tuesday था, तो 15 August 2024 कौन-सा दिन होगा?
A) Wednesday
B) Thursday
C) Friday
D) Saturday
- 2024 leap year है और date February के बाद है.
- इसलिए difference = 366 days
- 366 ÷ 7 → remainder 2
- Tuesday + 2 = Thursday
15. एक 30-day month Wednesday से शुरू होता है। उस महीने में कितने Thursdays होंगे?
A) 4
B) 5
C) 6
D) Cannot be determined
- 30 = 28 + 2
- Extra days: Wednesday, Thursday
- इसलिए Thursday = 5 times
16. 2024 में कितने odd days होंगे?
A) 0
B) 1
C) 2
D) 3
- 2024 leap year है.
- 366 = 52 weeks + 2 days
Answer: C) 2
17. 1 January 1900 Monday था। 1 January 1901 कौन-सा day था?
A) Monday
B) Tuesday
C) Wednesday
D) Thursday
- 1900 leap year नहीं था.
- Normal year = +1
- Monday + 1 = Tuesday
18. दि किसी 31-day month का पहला दिन Tuesday है, तो कौन-कौन से days 5 बार आएंगे?
A) Tuesday, Wednesday, Thursday
B) Monday, Tuesday, Wednesday
C) Tuesday, Wednesday
D) Wednesday, Thursday, Friday
- 31 = 28 + 3
- Extra days: Tuesday, Wednesday, Thursday
19. यदि 1 January 2001 Monday था, तो 1 January 2002 कौन-सा day था?
A) Monday
B) Tuesday
C) Wednesday
D) Sunday
- 2001 normal year है.
- Monday + 1 = Tuesday
20. यदि 1 January 2000 Saturday था, तो 1 January 2001 कौन-सा day होगा?
A) Sunday
B) Monday
C) Tuesday
D) Wednesday
- 2000 leap year है.
- Leap year = 2 odd days
- Saturday + 2:
- Sunday → Monday
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