It's been under way since the 1970s but has been very patchy. The Statute Mile is still the only legal unit for roads in the UK; Network Rail still uses miles and chains (1ch = 22yds) for distances along railways; beer may still be dispensed in "pubs" in pints and half-pints. Many people stick to feet and inches or pounds and ounces (especially if cooking using older recipe-books) in common measurements even if using the SI units at work.
It was never Illegal.
1965
1975
the SI was replaced because the metric system was more accurate and percise.
1977
The SI system was established in 1960.
The metric system, of which the centimetre is a part, was introduced in 1799 in France.
Metric base is the measurement system that was used by government. This was back in the year 1970.
No it isn't.
the SI was replaced because the metric system was more accurate and percise.
In 1869Congress legalized the use of the metric system. In 1893 the Office of Weights and Measures adopted the metric system in legally defining the yard and the pound.
1977
Sometime between the 16th and the 17th centuries.
1400
The SI system was established in 1960.
The metric system, of which the centimetre is a part, was introduced in 1799 in France.
In 1793, France adopted as its official unit of length a metre.
In 2012, the production of silver in Australia was in excess of 24k metric tons. This amount is an all-time production high and is an increase of 28% since 2001.
Of course the metric system measures time. The second is one of the seven base units.
Australia's currency went decimal on 14th February, 1966. The decimal system is easier to use than others because it based on 10. The old Imperial monetary system was based on the old English system where there were 12 pennies in a shilling and 20 shillings in a pound or, 240 pennies in a pound. Australia's system of weights and measures went metric for the same reason in about 1973 or 1974.