julia

f0d1c387 - add zero and iszero to Dates.CompoundPeriod (#61280)

add zero and iszero to Dates.CompoundPeriod (#61280) Adds a `zero` and `iszero` to `Dates.CompoundPeriod`. Solves issue #61268 --------- Co-authored-by: Steven G. Johnson <stevenj@mit.edu>