SSC CGL Reasoning · Free notes

Calendar and Clock: SSC CGL Reasoning

Calendar and Clock has 9 questions in the SSC CGL Tier I bank, five from the 2023 shifts and four from the 2025 shifts, and all nine are about the calendar: none asks about a clock. Seven are EASY and two MODERATE. Every one rests on a single fact: the week repeats every 7 days, so only the remainder after dividing by 7 moves the weekday. Turn each question into a count of days, take that remainder, and move along the week; done that way, each takes a few seconds.

The handout has every subtopic, worked example, formula and trap with answers shown. The formula sheet is the chapter’s formulas and traps alone, on one page.

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Subtopic notes

Calendar
9 PYQs
The days of the week repeat every 7 days, so only the remainder after dividing a number of days by 7 (the odd days) moves the weekday; a year adds 1 odd day, a leap year 2.

Formula & revision sheet

2 formulas · 6 gotchas across all subtopics — the exam-eve cheat-sheet

Calendar

Formulas (2)

The weekday after a number of days · Odd days $\text{Odd days} = \text{remainder when the number of days is divided by } 7$
Odd days in a year and leap years · Odd days over whole years $\text{Odd days} = \text{number of years} + \text{number of 29 Februarys in between}$

Watch out for (6)

Counting both ends
→ Counting dates forward and back
Giving every month 30 days
→ Counting dates forward and back
Counting today as one of the days
→ The weekday after a number of days
Forgetting the month's length
→ The weekday after a number of days
Calling every century year a leap year
→ Odd days in a year and leap years
Giving the extra day to the wrong span
→ Odd days in a year and leap years

PYQ weightage by concept

3 concepts · 9 PYQs — where the marks actually sit, so you know what to drill first

Calendar9 PYQs · 100%

Concept	PYQs	Share
Counting dates forward and back	3	33%
The weekday after a number of days	3	33%
Odd days in a year and leap years	3	33%

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