Date2Day

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📆 Date2Day — Find the Day for Any Date

Date2Day is a C program that calculates the day of the week for any given date using Zeller's Congruence. It accepts date, month (as a string), and year from the user and outputs the corresponding weekday.

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🔧 Features

• 📅 Accepts month names like "March", "December", etc.
• ✅ Accurate weekday detection using Zeller's formula
• 🧠 Handles January and February as per the algorithm's rules
• 🖥️ Console-based, beginner-friendly, no extra libraries

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🛠 How It Works

1. User enters:
   • Day (number)
   • Year (4-digit)
   • Month (as a name, case-sensitive)
2. The program uses strcmp() to convert month name to Zeller format
3. Applies Zeller’s Congruence to compute the weekday
4. Prints the full result (e.g., 14 June 2025 is Saturday)

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📅 Zeller's Congruence

h = (q + (13 * (m + 1)) / 5 + k + k / 4 + j / 4 + 5 * j) % 7;

Where:

• h → Day of the week (0 = Saturday, 1 = Sunday, ..., 6 = Friday)

• q → Day of the month

• m → Month (3 = March, 4 = April, ..., 12 = December, Jan & Feb are counted as 13 & 14 of previous year)

• k → Year of the century (year % 100)

• j → Zero-based century (year / 100)

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💡 Example:

📦 Compile & Run

gcc Date_to_Day.c -o Date2Day
./Date2Day

🚀 Sample Output

Enter the date: 14 Enter the year: 2025 Enter the month name: June

14 June 2025 is Saturday

📃License

See included LICENSE file for more details.

Author-Silven Mohan