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Seconds, minutes and hours.
Some common units of time are the year, decade, century, millenium, month, week, day, hour, minute, second, millisecond, microsecond, nanosecond...
Two common units for mass are kilograms and grams
As far as I am aware, the second (measure of time) is the only unit common to the English and metric system.
You can't convert that. You can only convert units that measure the same type of thing - for example, units of length to units of length, units of mass to units of mass, units of time to units of time, etc.