What Day of the Week Was July 20, 1985? Discover Your Birth Day Instantly

July 20, 1985 was a Saturday. If you were born on this date, your birthday fell on the weekend! To find out the day of the week for any birthday: yours, a loved one's, or a historical figure's: you can use simple tools and a little calendar know-how. Below, you'll discover how to determine the day you were born, why it matters, fun ways to celebrate your "birth day," and how to answer the question "what day of the week was I born" for any date.

How to Instantly Find the Day of the Week You Were Born

Curious about your birth day? It’s easier than you might think! Here are the most accurate and convenient ways to check the day of the week for any birthday:

• Online Lookup Tools: Use a birth-date tool like Birthday Hunter’s age calculator. Enter a date of birth to see the weekday along with age in years, months, and days. If you only want to count down to the next birthday, the birthday countdown tool is useful for that separate job.
• Calendar Apps: Scroll back in your phone or computer’s calendar app to the year and month you were born, then locate your birth date.
• Manual Calculation: If you enjoy puzzles, try the Doomsday algorithm or Zeller’s Congruence (see next section for step-by-step instructions).
• Printed Perpetual Calendars: Some libraries and bookstores carry wall charts or pocket guides that match years, months, and days.

For the fastest answer, use an online tool that accepts a full birth date. Birthday Hunter’s age calculator shows the weekday and your age in years, months, and days, which can be handy for milestone planning.

How the Calendar Works: Why the Day Shifts Each Year

Ever wonder why your birthday lands on a different weekday each year? Here’s a quick breakdown of the logic behind calendar days:

• A year has 365 days (366 in a leap year), which is not evenly divisible by 7 (the number of days in a week).
• Each new year, your birthday advances by one weekday (e.g., Saturday to Sunday), or two if there was a leap year in between.
• Leap years occur every four years, adding February 29; this "skips" your birthday ahead by an extra weekday.

So, if you were born on Saturday, July 20, 1985, your birthday in 1986 was on a Sunday, in 1987 on a Monday, and so on. But after a leap year, it jumps two days forward. This pattern makes birthday planning a bit more interesting!

Manual Calculation: Zeller’s Congruence (For the Curious)

If you love math or want to impress your friends, try Zeller’s Congruence: a famous formula to calculate the weekday for any date. Here’s how you’d do it for July 20, 1985:

1. Adjust the month and year if it’s January or February (not needed for July).
2. Assign numbers: July = 7, Day = 20, Year = 1985.
3. Plug into the formula: h = (q + [(13(m+1))/5] + K + [K/4] + [J/4] + 5J) mod 7, where:
   • h = day of week (0=Saturday, 1=Sunday, ... 6=Friday)
   • q = day of month (20)
   • m = month (7)
   • K = year of the century (85)
   • J = zero-based century (19)
4. Calculate step by step: 20 + floor(13 x 8 / 5) + 85 + floor(85 / 4) + floor(19 / 4) + 5 x 19 = 20 + 20 + 85 + 21 + 4 + 95 = 245. Then 245 mod 7 = 0, which means Saturday.

Or, just use a free online calculator for instant results.

Why Knowing Your Birth Day Matters

Discovering the day of the week you were born is more than trivia: it’s a fun detail that connects you to personal history, traditions, and even pop culture. Here are five reasons people love uncovering their "birth day":

• Milestone Reflections: It’s a great conversation starter and a way to mark special anniversaries (e.g., "My 40th birthday is on a Saturday again!").
• Cultural Significance: In some families or communities, a weekday of birth may be tied to naming traditions or storytelling. These customs vary, so it is best understood as a tradition rather than a universal rule.
• Birthday Planning: Knowing your next birthday’s weekday helps schedule parties, trips, or time off work.
• Astrology & Numerology: Some people enjoy exploring birthday-based traditions for entertainment or personal reflection.
• Genealogy: Adds color to family trees and stories ("Grandma was born on a Sunday!").

Tracking your birthday’s weekday over the years can also reveal fun patterns: like who in your family shares a "birth day," or which years your birthday will next fall on a weekend.

How to Make Your Birth Day Special

Once you know the day of the week you were born, there are creative ways to celebrate or share that fun fact:

• Birthday Countdown: Get excited for your next milestone by using a birthday countdown tool: it tells you exactly how many days are left and which day of the week your birthday will land on.
• Birthday Wishes: Personalize your party invites or social media posts with unique messages. The birthday wish generator can help you craft the perfect greeting.
• Party Themes: Plan a "Throwback Saturday" (or whatever your birth day was!) party with music and trends from your birth year and weekday.
• Family Traditions: Start a tradition of sharing your "birth day" story or comparing which family members were born on the same weekday.
• Fun Facts Board: At a birthday gathering, set up a poster listing everyone’s birth days of the week.

These ideas can make your special day even more memorable and meaningful.

Comparing Birth Days: Why Some Dates Feel Extra Special

Did you know that some people feel extra lucky or nostalgic when their birthday falls on a weekend? Here’s a breakdown comparing different "birth days":

• Saturday or Sunday: These can feel convenient for larger celebrations because guests may have fewer weekday commitments.
• Friday: Great for evening parties and starting the weekend with a bang.
• Monday-Thursday: Sometimes trickier for big gatherings, but perfect for quieter, more intimate birthdays or midweek treats.
• Holidays: If your birthday lands near a major holiday, you may share the spotlight or get extra time off.

Some people also look ahead to see when their next birthday lands on a weekend so they can plan a trip or party date.

Other Fascinating Facts About Your Birthday

• Born on a Leap Day? February 29 birthdays only occur every four years: making the day of the week even more unique!
• Shared Birthdays: Many people enjoy finding others who share the same month and day, even though the weekday changes from year to year.
• Birth-Year Trivia: You can also look up notable events or public figures connected to your birth date if you enjoy date-based trivia.
• Global Traditions: In some countries, the day of the week you were born is celebrated with special names or rituals.
• Repeat Weekdays: Your birthday will return to the same weekday from time to time, but the spacing changes because leap years shift the calendar pattern.

Want more birthday ideas or planning prompts? Visit the Birthday Hunter guides hub for more articles.

Frequently Asked Questions

How accurate are online tools for finding my birth day?

They can be accurate for modern dates when you enter the correct birth date. If you are checking a very old date or a date recorded under a different calendar system, use a specialized historical reference as well.

Can I find out the weekday for anyone’s birthday, even decades ago?

Yes. For a modern birth date, you can use the same method for your own date, a relative’s date, or a public figure’s date. Just enter the full date carefully. Very old dates may need a specialized historical reference.

Does the day of the week I was born have any special meaning?

It may have personal or cultural meaning, depending on your traditions. Some families and communities connect birth weekdays with names, stories, or symbolic traits, but these ideas are traditions rather than scientific facts.

How can I use Birthday Hunter tools to make my next birthday memorable?

You can use birthday countdown to see how long until your next birthday, the age calculator to check your age and birth weekday, and the birthday wish generator to draft a message you can edit and copy.