From smallest to largest:
second
hour (60 minutes, 3600 seconds)
day (24 hours)
week (7 days)
fortnight (14 days, from fourteen night)
month (28 to 31 days)
decade (10 years, 120 months)
century (10 decades, 100 years)
millennium (1000 years)
The only standard unit missing is the minute (60 seconds).
The second millennium.
1935 was in the second millennium (1000 AD to 2000 AD).
In the year 2000, januari 1.
There has been only one millennium so far, which was from the year 1001 to 2000. The current millennium started in the year 2001 and will end in the year 3000. Therefore, there has been one completed millennium and we are currently in the second millennium.
From the 1st of January 1001 to the 31st of December 2000.
second, minute, hour, day, week, fortnight, month, year, decade, century, millennium.
A second, minute, hour, day, week, fortnight, month, year, decade, century, millennium are some.
Planck time, nano second, microsecond, millisecond, second, minute, hour, day, week, fortnight, month, year, decade, century, millennium are some.
There are many more than four units of time. Here are a dozen of them: -- picosecond -- microsecond -- second -- minute -- hour -- day -- week -- fortnight -- year -- decade -- century -- millennium
nanosecond, millesecond, second, minute, hour, day, week, fortnight, month, year, decade, century, millennium and multiples and variants of the above, e.g. two lunar months, one sidereal year, three solar years.
Year, Decade, Century, Millennium A picosecond is one trillionth (10-12) of a second, which is one thousandth of a nanosecond and one millionth of a microsecond.
The last decade of the second century.
2010 is the beginning of the second decade of the 21st century.
In 2010. To prove it, look at the eighties: 1980-1989. So the second decade of the twenty-first century is from 2010-2019.
Since we are now in the year 2010. You can think about words that you might have heard used to describe groups of years.You have a decade, which refers to 10 years. Examples of years in a decade would be for the 1990's for example, and you would have the years 1990-1999; or the 1960's which would be 1960-1969.Then, the next highest grouping of years would be a century, which is 100 years. These are a bit tricky to convert. You would talk about the 17th century, but mean the 1600's (sixteen huindreds); or mention the 20th century, but mean the 1900's (nineteen hundreds). This is due to how number groupings happen.Think about how your age is discussed. That from birth to age 9, you were in your first decade, but your age was 0-9. Your second decade began with age 10-19 (even though your age was written with a "1" it was still your second decade of living), and so on. So, at age 31, you would be in your fourth decade.So, getting back to year grouping names you began with year, then decade, then century, and the next grouping, would be a millennium.A millennium would be one thousand years! And if you notice, we are in year 2010--having begun our third millennium! (remember the silly way that number groupings happen) because from the year zero a.d. to 999a.d. would be the first millennium, then from 1000a.d. to 1999a.d. you would have the second millennium, and from 2000a.d. to 2999a.d. you would be in your third millennium.
The Letter "D"
The SI unit of time is the second. Other units include (of course) millisecond, microsecond, etc.; for larger lengths of time, the traditional time system is usually used, with units such as minute, hour, day, week, month, year, decade, century, millennium.