Determining Calendar Dates From Stardates

Note: The following Stardate calculations are meant to express general trends across all episodes of each Star Trek series. These calculations are not meant to be accurate for small time scales, such as hours or minutes within a single episode.



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Expressing Contemporary Dates as Stardates

Find the fictional Stardate that corresponds to "today's" date

Since the Stardate systems used in various Star Trek episodes are meant to measure time in the Twenty-third and Twenty-fourth Centuries, the same Stardate system cannot be used to express contemporary dates (i.e., in the Twentieth and Twenty-first Centuries). However, for those who would like to create Stardates to represent contemporary dates, there are three methods that can be used: Represent the current date in YYMM.DD format, where "YY" is the current year minus 1900, MM is the current month (01-12), and DD is the current day of the month (01-31).



For example, September 08, 1966, would be written as "Stardate 6609.08" in the YYMM.DD format. Another digit must be added for years after 1999, such that September 11, 2001, would be written as "Stardate 10109.11" in the YYMM.DD format. This system can be used to express any year after 1900 in Stardate format.



This system also roughly corresponds to the Stardates used in the first six Star Trek motion pictures, such that if a new movie were made today in The Original Series continuity, then its Stardate would be close to the YYMM.DD format.



Using the new Stardate format in Star Trek XI, dates may be expressed in YYYY.xx format, where YYYY is the actual four-digit year, and .xx represents the fraction of the year to two decimal places (i.e., hundredths of a year). For example, January 1, 1999, would correspond to Stardate 1999.00, while July 2, 1999, would correspond to Stardate 1999.50 (half-way through the year 1999).



For any given date, simply calculate the number of days it has been since January 1, then express that as a percentage of the year (the number of days since January 1 divided by 365 should give the number to follow the decimal in the Stardate).



Use the Stardate of the current Star Trek episode or movie to represent today's Stardate. , using The Next Generation Stardate system (i.e., that would be the Stardate of this week's episode if The Next Generation and its spinoffs were still in production).



To express other contemporary dates in The Next Generation Stardate format, use the calculator below.

Twenty-fourth Century Stardates

Calculating calendar dates in The Next Generation, Deep Space Nine, and Voyager

The following calculators are based on the above explanation.

Twenty-third Century Stardates

Calculating calendar dates in The Original Series

The following calculators are based on the above explanation.

Late Twenty-third Century Stardates

Calculating calendar dates in The Movie Series

Star Trek XI-XII Stardates

Calculating calendar dates in the latest movie

Date inconsistencies in episodes