To find the day-name of 11-October-2023, you need to follow a systematic approach that involves understanding how the days of the week cycle and calculating the day based on the specific date. This skill is valuable as it enables you to quickly determine which day of the week any given date falls on, aiding in scheduling activities or events efficiently.

Manually calculating the day-name involves utilizing an algorithm known as Zeller’s Congruence. This algorithm assigns a numerical value to each day of the week, making it possible to determine the day-name for any date. By inputting the day, month, and year into the formula, you can obtain the corresponding day of the week, with Sunday represented as 0, Monday as 1, and so forth.

Zeller’s Congruence is a mathematical formula devised by Christian Zeller in the 19th century, enhancing the efficiency of finding the day of the week for a given date. The algorithm considers the day, month, and year of a date to yield the accurate day-name, streamlining the process and eliminating the need for laborious manual calculations.

By understanding and applying Zeller’s Congruence, you can effortlessly determine the day-name of any date, including the specific date 11-October-2023, enhancing your time management and organizational skills. This method of calculation has stood the test of time, remaining a reliable tool for quickly identifying the day of the week associated with a particular date, regardless of the era or technological advancements.