Calendar topic also covers 1-2 mark question in Reasoning section. So, we are going to discuss basic concepts and points before we start calculation to find day of date.

#### How Odd days are calculated:

– You know there are __7 days in a week__. And, there are 365 days in General Year and 366 days in Leap Year.

Hence, **Odd days** can be defined the __remainder of a number when divided by 7__.

- 365/7 = 1 odd days.
- And, 366/7 = 2 odd days.

- Let’s take an example of January (31 days).
- 31/7 = 3 odd days.
- Similarly, Odd days for every month can be calculated.

#### Important Points need to remember:

– Earth completes the revolution in __365 days, 5hour, 48 minutes and 47 seconds__.

– In 365 days, 52 weeks and __1 odd days__.

– In 366 days, 52 weeks and __2 odd days__.

– In __100 years__, there are **5** odd days.

– In __200 years__, there are **3** odd days.

– In __300 years__, there are **1** odd days.

– In __400 years__, there are **0** odd days. .

- Jan- 3 odd days; Feb- 0 odd day; Mar- 3 odd days. Now, take take together, sum will 6 odd days. So, from 1-3 months, there are
__6 odd days__. - Similarly, from Jan to June (1-6 months), there are 6 odd days.
- Similarly, from Jan to September (1-9 months), there are 0 odd days.
- Similarly, from Jan to Dec (1-12), there are 1 odd days.

– __ Short trick__ has been evaluated from this. When you have to find odd from first six months you know that there are 6 odd days. Hence, reduced the calculation. And, it can remembered as “

**6601**“

- Jan- 3 odd days; Feb- 1 odd day; Mar- 3 odd days. Now, take take together, sum will 7 odd days. So, from 1-3 months, there are
__0 odd days__. - Similarly, from Jan to June (1-6 months), there are 0 odd days..
- Similarly, from Jan to September (1-9 months), there are 1 odd days.
- Similarly, from Jan to Dec (1-12), there are 2 odd days.

– __ Short trick__ has been evaluated from this. When you have to find odd from first six months you know that there are 6 odd days. Hence, reduced the calculation. And, it can remembered as “

**0012**“

– In 1900 to 2100 years, the calendar repeats itself in the same format. It means

- If the present year is
__leap year__, the same date and day calendar format will come after__28 years__. - After leap year, this year will be repeated in
__6 years__. - Next year, it will be repeated in
__11 years__.

* Ques-1:* Ram is born on 18, March, 2008. When the same day on this date will again be repeated.

*2008 is leap year. Hence, add 28 years in it. The same calendar will come on 2036.*

**Ans:**#### Other useful facts:

– This English Calendar is called __ Gregorian Calendar__.

– India adopted its official calendar in July, 1957.

– Indian National Calendar is

**Saka Calendar**(

*Hindu Calendar*)

**–**It is a Lunar calendar which means it has 354 days and 9 hour. And, 1 month is added after every 34 months to match with Gregorian calendar and present date and time.

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