DataFrame.asfreq(freq, method=None, how=None, normalize=False)

Convert all TimeSeries inside to specified frequency using DateOffset objects. Optionally provide fill method to pad/backfill missing values.

Parameters :

freq : DateOffset object, or string

method : {‘backfill’, ‘bfill’, ‘pad’, ‘ffill’, None}

Method to use for filling holes in reindexed Series pad / ffill: propagate last valid observation forward to next valid backfill / bfill: use NEXT valid observation to fill method

how : {‘start’, ‘end’}, default end

For PeriodIndex only, see PeriodIndex.asfreq

normalize : bool, default False

Whether to reset output index to midnight

Returns :

converted : type of caller