# How to convert Stardate to Gregorian calendar date? [duplicate]

Possible Duplicate:
How do stardates work?

The accepted answer to this question: How do stardates work? has some points, but still I have difficulties in conversion.

For example, I have found `Stardate 64333.4` in Star Trek: Countdown comic which was launched as prequel of 2009 Star Trek movie. This stardate is stated by comic writer to us... not by a starship captain in captain's log. So, I don't think, it has an affect with vessel's warp.

Plus, stardate is universal standard among many races. So, there must be a local conversion standards of individual races. I'm just asking for that of humans.

• The answer on the other question is about as definitive as you can get, I think. In TNG/DS9/VOY-style Stardates, `64333.4` about 1/3rd through 2387, around 9:30 AM. – Izkata Apr 22 '12 at 4:48
• In the 2009 movie's version of Stardates, `64333.4` is the 4th day of the year 64333. – Izkata Apr 22 '12 at 4:51
• @Izakta Are you saying 2387 because Romulus was destroyed in same year? Can you state exact mathematical formula which is applicable on atleast TNG/DS9/VOY? – Baby Yoda Apr 22 '12 at 5:04
• @Izakta And, how do you get 9:30AM? – Baby Yoda Apr 22 '12 at 5:07
• 'Tis an answer now ;) – Izkata Apr 22 '12 at 5:26

The Original Series, the Star Trek Guide:

Pick any combination of four numbers plus a percentage point, use it as your story's stardate. For example, 1313.5 is twelve o'clock noon of one day and 1314.5 would be noon of the next day.

From the Star Trek: The Next Generation Writer's/Director's Guide:

A stardate is a five-digit number followed by a decimal point and one more digit. Example: "41254.7." The first two digits of the stardate are always "41." The 4 stands for 24th century, the 1 indicates first season. The additional three leading digits will progress unevenly during the course of the season from 000 to 999. The digit following the decimal point is generally regarded as a day counter.

And from the Stardate page on Memory Alpha that the other answer references, evidence that TNG/DS9/VOY-era used decimal digits the same as TOS-era:

In addition to the overall rate of approximately 1,000 units per year, many episodes confirm the 24-hour stardate unit which was first mentioned in the TOS bible, with midnight at .0 and noon at .5.

So, how did I come up with that particular date?

In-universe, the first season of TNG occured in 2364. Stardate 64333.4 is (64-41=23) 23 years after Stardate 41xxx, the first season of TNG. So 64xxx corresponds to the year 2387 (2364+23).

It is 1/3rd through the year because 333 is about 1/3rd of 1000, the length of a year.

9:30 AM comes from the .4, which means the day is 40% completed. According to Google, that's 9.6 hours - 9:36 AM.

• Coincidentally, we are currently only about 9-10 days short of being 1/3rd through the year ;) – Izkata Apr 22 '12 at 5:29
• You've copied & pasted like dumb: `The first two digits of the stardate are always "41." The 4 stands for 24th century` ~> Why don't 6 stands for 26th century... – Baby Yoda Apr 22 '12 at 5:55
• From answer of that question, `.4` should tell about day of year. How did you calculate time using `.4`? – Baby Yoda Apr 22 '12 at 5:58
• @SachinShekhar `The 4 stands for 24th century, the 1 indicates first season.`, and 42 is the second season (1 year later), 43 is the 3rd season, and so on. The linked question/answer goes on with examples that the "4" indicating "24th century" was abandoned, and that those digits simply indicate the year/tv season. – Izkata Apr 22 '12 at 6:00
• @SachinShekhar An additional answer I made on the same topic that basically just shows that the writers weren't consistent: scifi.stackexchange.com/a/14461/2242 – Izkata Apr 22 '12 at 6:08