Use this useful tool to convert time choosing one of the 15 units of measurment included in this app, that are:
Years:
day year (365 days), leap year (366 days), julian year (average) and gregorian_year_(average)
Standard time units:
week, hour, minute, second and millisecond
Mayan calendar:
kin, uinal, tun, katun and baktun
For every units of measurment are also included formulas to convert that unit as you want.