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# Time Conversion Table

 fractions of a second metric name 0,000 000 000 000 000 000 000 001 yoctosecond [ ys ] 0,000 000 000 000 000 000 001 zeptosecond [ zs ] 0,000 000 000 000 000 001 attosecond [ as ] 0,000 000 000 000 001 femtosecond [ 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 ] 1.0 second [ 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 - anniversaries number 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.