HackerRank Java Date and Time Solution | findDay() with Calendar Class (Day 2 Tutorial)

earn how to convert any date to its day of the week in Java using Calendar.getInstance() — Day 2 of my Java HackerRank series. Fast, beginner-friendly, and ready for interviews!
Day 2 — Java HackerRank Challenge: findDay()

In this video we use Java's Calendar class to convert a date (MM DD YYYY) into the correct day of the week (in CAPITALS). Perfect for beginners and for HackerRank practice.

✅ Key points:
- Use Calendar.getInstance()
- Use calendar.set(year, month - 1, day) // important: month is 0-indexed
- calendar.get(Calendar.DAY_OF_WEEK) → map to string DAY

Sample:
Input: 08 05 2015
Output: WEDNESDAY
0:00 Intro to findDay Challenge
0:30 Setting Up Calendar
1:15 Handling 0-Indexed Months
2:00 Code Example & Output
3:00 Tips for HackerRank Submission
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Java date to day of week, HackerRank Java tutorial for beginners, coding interview prep, Calendar class example.
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