Julian Day -- Fun and Games

The recent thread What’s your global ranking? prompts me to suggest we have some fun with Julian Day conversions and such.

If you need some background, see Julian Day for

and more details.

Conversions can be done at
Julian Day and Civil Date Calculator


Julian Date Converter
Calendar date to Julian date

Year: CE BCE
Month: January February March April May June July August September October November December
Hour: Minute: Second: Universal Time (UT1)

Julian date to Calendar date

Julian Date:



among other such sites.


Something I discovered long ago related to James Byron Dean (February 8, 1931 - September 30, 1955)

The Julian date for CE 1931 February 8 00:00:00.0 UT is
JD 2426380.500000

The Julian date for CE 1955 September 30 00:00:00.0 UT is
JD 2435380.500000

Difference in days = 9000.


Today’s JD is Nov/18/2011 = 2455884 JD

See what fun things you can add to this thread involving JD conversions and differences.

Another example with relevance today:

John Fitzgerald “Jack” Kennedy (May 29, 1917 - November 22, 1963)

The Julian date for CE 1917 May 29 00:00:00.0 UT is
JD 2421377.500000

The Julian date for CE 1963 November 22 00:00:00.0 UT is
JD 2438355.500000

Difference = 16978

Okay. Since I have two dud threads that relate to this idea, I won’t start another. But I had the notion of adding to the thrills of the Celebrity Death Pools where Zsa Zsa’s name crops up enough for me to know I’m not the only one thinking about her.

So rather than bump Morbid question: Is anybody else waiting for the other shoe to drop? [Zsa Zsa Gabor] which I started 09-08-2010, 09:46 AM and which had gotten to Post #17 on 11-03-2011, 09:23 AM, I opted to kick this thread with the challenge to use this information gathered from


Zsa Zsa Gabor, born February 6, 1917


to see that Ms. Gabor has accumulated (as of today)

34645 days = 94.85284 Years = 94 Years and 311 Days


Now, the “added thrills” concept goes to the prediction of how many days she will last, and/or what Julian Day will mark her passing.

Other variations on the same theme are welcomed.

I tried it for my still living grandmother, who was born December 17th, 1904. But it wouldn’t give a number.

I was 2747804616.

Here’s what I got:

Today’s JD is 2455910

So that makes your grandmother 39079 days old. Divide by 365.25 to get 106.9924709 years. Subtract the 106 for .9924709 and multiply that by 365.25 to get 362.5 and that makes her 106 years and 362.5 days old.

I’m not clear on where your 2747804616 came from. Are you?

That number is how many people were on the planet when I was born.

Great! I had just forgotten that I had quoted that thread as a lead-in to this one. Thanks for helping my alleged memory! :slight_smile:

Here’s a sample of the sort of numbers fun to be had:

The Julian date for CE 1917 February 6 00:00:00.0 UT is
JD 2421265

The Julian date for CE 2011 December 15 00:00:00.0 UT is
JD 2455910

which means that Ms. Gabor has accumulated (as of today)

34645 days = 94.85284 Years = 94 Years and 311 Days


In 55 days Zsa Zsa will have made it to a total of 34700 days.

That will be JD 2455965 and if she makes it she’ll be 95 years and 1 day old on

JD 2455965.000000 is
CE 2012 February 07 12:00:00.0 UT Tuesday