1 millisecond [ms] = 0.001 second [s]

1 minute [min] = 60 second [s]

1 hour [h] = 3600 second [s]

1 day [d] = 86400 second [s]

1 week [wk] = 604800 second [s]

1 month [mo] = 2628000 second [s]

1 year [y] = 31557600 second [s]

1 decade [decade] = 315576000 second [s]

1 century [century] = 3155760000 second [s]

1 millennium [millennium] = 31557600000 second [s]

1 microsecond [µs] = 0.000001 second [s]

1 nanosecond [ns] = 1e-9 second [s]

1 picosecond [ps] = 1e-12 second [s]

1 femtosecond [fs] = 1e-15 second [s]

1 attosecond [as] = 1e-18 second [s]

1 shake [shake] = 1e-8 second [s]

1 month (synodic) [mo (syn)] = 2551443.84 second [s]

1 year (julian) [y (Jul)] = 31557600 second [s]

1 year (leap) [y (leap)] = 31622400 second [s]

1 year (tropical) [y (trop)] = 31556930 second [s]

1 year (sidereal) [y (sid)] = 31558149.54 second [s]

1 day (sidereal) [d (sid)] = 86164.09 second [s]

1 hour (sidereal) [h (sid)] = 3590.1704166667 second [s]

1 minute (sidereal) [min (sid)] = 59.8361736111 second [s]

1 second (sidereal) [s (sid)] = 0.9972695602 second [s]

1 fortnight [fortnight] = 1209600 second [s]

1 septennial [septennial] = 220752000 second [s]

1 octennial [octennial] = 252288000 second [s]

1 novennial [novennial] = 283824000 second [s]

1 quindecennial [quindecennial] = 473040000 second [s]

1 quinquennial [quinquennial] = 157680000 second [s]

1 planck time [tP] = 5.39056e-44 second [s]