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Standard time of day is defined by various time scales, such as UTC, which are now usually based upon the metric base unit of time, the second
Some proposals for alternative units of metric time are accompanied by decimal time scales for telling the time of day based upon these alternative units
Other proposals called "metric time" refer only to decimal time, and therefore are not truly metric.
French decimal time is sometimes called "metric time" because it was introduced around the same time as the metric system and both were decimal, but it was not part of the decree creating the original metric system and its units were named for the hour, minute and second, instead of using metric prefixes
Other decimal time standards, such as Swatch Internet Time, are not considered metric time.
In computing, at least internally, metric time gained widespread use for ease of computation
Unix time gives date and time as the number of seconds since January 1, 1970, and Microsoft's FILETIME as multiples of 100ns since January 1, 1601
VAX/VMS uses the number of 100ns since November 17, 1858 and RISC OS the number of centiseconds since January 1, 1900
(Each of these is not strictly linear, as they have discontinuities at leap seconds.)
The main problem of metric time lies in the units
The International System of Units has only developed prefixes regarding 10 units exponentially in both the multiple and submultiple directions
The first three multiples would be viable for use within a metric time system; they are 101 (decasecond = 10 seconds), 102 (hectosecond = 100 seconds; 1.666 minutes) and 103 (kilosecond = 1 000 seconds; 16.666 minutes) respectively
However, the fourth value in the SI Units is 106 (megasecond = 1 000 000 seconds; 16 666.666 minutes; 277.777 hours; 11.574 days)
Followed by 109 (gigasecond = 1 000 000 000 seconds; 16 666 666.666 minutes; 277 777.777 hours; 11 574.074 days; 31.689 years); a relatively nonviable unit with which to measure human time/life
To make this system of prefixes work for metric time, standard units and prefixes would have to be developed for the 4th and 5th exponents to make metric time viable to human life
These would be:
Metric time appears in science fiction writing on occasion
In the novel A Deepness in the Sky by Vernor Vinge, the spacefaring Qeng Ho culture is depicted as using metric units such as the kilosecond and megasecond for all time interval measurements.
The novels Accelerando and Glasshouse by Charles Stross have several uses of metric time, including kiloseconds, megaseconds, and megayears
In the second case, humans are living in habitats circling brown dwarfs, with no lingering connection to the Solar System that gave birth to the earlier time scale