Time Conversion Table

fractions of a secondmetric name
0,000 000 000 000 000 000 000 001yoctosecond [ ys ]
0,000 000 000 000 000 000 001zeptosecond [ zs ]
0,000 000 000 000 000 001attosecond [ as ]
0,000 000 000 000 001femtosecond [ fs ]
0,000 000 000 001 [ trillionth ]picosecond [ ps ]
0,000 000 001 [ billionth ]nanosecond [ ns ]
0,000 001 [ millionth ]microsecond [ µs ]
0,001 [ thousandth ]millisecond [ ms ]
0.01 [ hundredth ]centisecond [ cs ]
1.0second [ s ]
seconds to years 
60 seconds= 1 minute [ mean solar ]
59.83617 seconds= 1 minute [ sidereal ]
60 minutes= 1 hour
24 hours= 1 day
3,600 seconds= 1 hour
86,400 seconds= 1 day [ mean solar ]
86,164.09 seconds= 1 day [ sidereal ]
7 days= 1 week
168 hours= 1 week
14 days= 1 fortnight
28, 29, 30 or 31 days= 1 month
365 days= 1 year
366 days= 1 leap year
12 months= 1 year
31,536,000 seconds= 1 year [ calendar ]
31,558,150 seconds= 1 year [ sidereal ]
31,556,930 seconds= 1 year [ tropical ]
9,460,550,000,000,000 metres= 1 light year
299,792,458 metres per second ( m/s )= speed of light
parsec= approx. 3.25 light years
year intervals – anniversariesnumber of years
Biennial
2
Triennial
3
Quadrennial
4
Quinquennial
5
Hexennial *
6
Septennial
7
Octennial
8
Novennial
9
Decennial
10
Hendecennial *
11
Duodecennial
12
Tredecennial *
13
Quindecennial
15
Sextodecennial *
16
Septendecennial
17
Vigintennial *
20
Trigentennial *
30
Quadragennial
40
Quinquagenary
50
Sexagennial *
60
Septuagennial *
70
Septuagesiquintennial *
75
Octogintennial *
80
Nonagintennial *
90
Centennial
100
Quasquicentennial
125
Sesquicentennial
150
Terquasquicentennial or Septaquintaquinquecentennial *
175
Bicentennial
200
Quasquibicentennial *
225
Semiquincentennial *
250
Tercentennial
300
Semiseptcentennial *
350
Quatercentenary
400
Quincentennial
500
Sexcentennial *
600
Septcentennial *
700
Octocentennial
800
Millenial
1,000
Quindecimillenial
15,000
Note:- Interval names marked with a * do not appear in major dictionaries but follow a logical linguistic progression.
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