`period_to_seconds()`

approximately converts a period to seconds assuming
there are 365.25 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)

## Arguments

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

## Value

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