`period_to_seconds`

approximately converts a period to seconds assuming
there are 364.25 days in a calendar year and 365.25/12 days in a month.
`seconds_to_period`

create a period that has the maximum number of
non-zero elements (days, hours, minutes, seconds). This computation is exact
because it doesn't involve years or months.

`period_to_seconds(x)`seconds_to_period(x)

x

A numeric object. The number of seconds to coerce into a period.

A number (period) that roughly equates to the period (seconds) given.