From Activity 1, Angshu's mail states 'It's 2 o'clock in the afternoon now.' This directly uses 'it' to give time, as described in 'Use' section, point 4.
Class 6 › English Grammar and Composition › Chapter 7: Introductory 'There' & 'It' › Topic: Understanding the use of 'it' for time, day, month, date, weather, and situations
Aligned to the NCTB national curriculum.