## September 17, 1023: Day of the Week

September 17, 1023 was the 260th day of the year 1023 in the Gregorian calendar. There were 105 days remaining until the end of the year. The day of the week was Wednesday.

The day of the week for September 17, 1023 under the old Julian calendar was Tuesday. Did you notice the difference with the Gregorian calendar?

If you are trying to learn Japanese then this day of the week in Japanese is Suiyōbi.

A person born on this day will be 1,000 years old today. If that same person saved a Nickel every day starting at age 4, then by now that person has accumulated \$18,207.10 today.

It’s game time! 🎰 I've got a fun challenge for you—can I guess your date of birth in less than 20 tries? Here’s how it works: I’ll give you a series of dates, and based on your answers, I’ll try to figure out your special day 🎂 It’s all in good fun, and it’s all about you! 🥳 Give it a shot, and let’s see if I can nail it down with this birthday guessing game 🎉 (Sponsored by MyBirthday.Ninja)

Here’s the September 1023 Gregorian calendar. You can also browse the full year monthly 1023 calendar.

September 1023
SunMonTueWedThuFriSat
123456
78910111213
14151617181920
21222324252627
282930

Can you guess my birthday in just 6 tries? 🥳🎉 Give it a shot and see if you can crack the code! 🎂🎈 Play the Birthday Challenge here. (Sponsored by MyBirthday.Ninja)

### Zodiac & Birthstone

Virgo is the zodiac sign of a person born on this day. Sapphire is the modern birthstone for this month. Agate is the mystical birthstone from Tibetan origin that dates back over a thousand years.

🎂 Ready for a little birthday guessing fun? 🎉 Let’s play a game and see if I can figure out your special day in less than 20 tries. 🎮 Accept challenge? (Sponsored by MyBirthday.Ninja)

### September 17, 1023 by the Numbers

• 365,603 days since September 17, 1023
• 1,000 years, 11 months, and 25 days ago
• 12,011 months since then
• September 17 is in the 38th week of the year 1023 (ISO 8601)
• 52,229 weeks ago
• The year 1023 is not a leap year

### Gregorian versus the old Julian calendar

A note to students, teachers, scholars and anyone else passionate about this topic. As stated in the front page, this website is using the Gregorian calendar as the basis for all “day of the week” computation whether or not the Gregorian calendar is relevant for the date in question (September 17, 1023). Educators should point out the primary reason why Pope Gregory XIII introduced a new calendar system in October 1582. That is, to make the computation for the annual date of Easter more accurate since it is the foundation of the Christian faith.

Even with that purpose in mind, the Gregorian calendar too will become out of sync. It has a known approximation error of about one day for every 7,700 years assuming a constant time interval between vernal equinoxes (which is not true). This is better compared to the one day for every 128 years error of the Julian calendar.

Now try another date like anniversaries, birthdays of someone you know or any other date that is special to you. Don’t forget to share the info to your friends, loved ones or social media followers. Who knows, they might appreciate and thank you for it.