We need a standard meridian for India because of the vast longitudinal extent of the mainland. Thus, there is a time lag of two hours from Gujarat to Arunachal Pradesh. Hence, time along the Standard Meridian of India passing through Mirzapur is taken as the Standard time for the whole country.

Why do we have standard time?
Standard time is crucial for organizing and coordinating activities across regions. Here's why we have standard time:

Uniformity and Consistency
Standard time provides a uniform system for measuring time across different locations. It ensures consistency in schedules, communication, and transportation networks.

Coordination and Synchronization
Having standard time allows people to coordinate activities and appointments effectively. It helps in synchronizing operations in various sectors such as transportation, finance, and telecommunications.

Global Communication
Standard time facilitates global communication by establishing a common reference point for time zones. It simplifies international interactions and avoids confusion caused by varying time systems.

Regulation and Organization
Standard time is regulated by official bodies to maintain order and efficiency. It helps in organizing events, meetings, and transactions by providing a standard framework for timekeeping.

Efficiency and Productivity
By following standard time, businesses can operate more efficiently and increase productivity. It enables smooth collaboration among employees, customers, and partners.

Time Zone Management
Standard time is essential for managing time zones and daylight saving adjustments. It ensures that transitions are executed smoothly and accurately, preventing disruptions in schedules.

Historical Significance
The development of standard time was a significant milestone in human history, revolutionizing how we perceive and measure time. It reflects our progress in creating systems for better organization and communication.
Standard time plays a vital role in our daily lives, offering a structured and reliable framework for managing time effectively. Its establishment has greatly benefited society by enhancing coordination, communication, and productivity.