get_new_start
calculates the new starting time of series
that is forwarded some number of steps.
get_new_start(y_start, y_freq, steps_forward)
Returns a length two numeric vector with the "year" (or "major")
time point in the first element the "quarter/month/week/day" (or "minor")
time in the second element for a series that is forwarded from y_start
steps_forward
steps forward.
original starting time of the series
frequency of the series
how many steps the series should be forwarded?