Basics of Calendar

A calendar is a systematic arrangement of day, week and month in a defined pattern.

Gregorian calendar is the world’s most popular calendar. It also happens to be the Indian National Calendar.

Each day is supposed to begin at mid night.

1st January, 0001 was Monday.
  • Day
    Every 24 hours constitute a day. It is the smallest unit of a calendar.
    A day is the 7th part of a week.

  • Week
    It is a grouping of 7 days: Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday

Yesterday = Today – 1 day

Tomorrow = Today + 1 day

Day before yesterday = Today – 2 days

Day after tomorrow = Today + 2 days

Q. If today is Sunday, then what day of the week will be 3 days after tomorrow?
(a) Thursday		(b) Wednesday	   (c) Saturday		 (d) Friday 


Today = Sunday
Tomorrow = Sunday + 1 = Monday
3 days after tomorrow = Monday + 3 days = Thursday
Answer: (a)

Q. If day before yesterday was Wednesday, when will Sunday be?
(a) 3 days after today  (b) Tomorrow  (c) Today  (d) Day after tomorrow


Today -2 = Wednesday
Or Today = Wednesday + 2 = Friday
Therefore, Day after tomorrow will be Today + 2 = Friday + 2 = Sunday.
Answer: (d)

  • Month
    A month is the 12th part of a year. It has 28, 29, 30 or 31 days.
    There are 12 months in a year.
  • Year
    It is the time taken by Earth to make one revolution around the Sun. A year has 12 months. A year is the 100th part of a century.

  • Century
    A block of 100 years is called a century.
    Examples of century years: 1100, 1800, 2000, 2100, 2900 etc.

Different types of questions asked:

  • Calendar Repetition
  • Finding the Day on a Particular Date (a reference day is generally given)
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