To calculate TimedeltaArray of difference between index values and index converted to PeriodArray at specified freq, use the datetimeindex.to_perioddelta() method. Set the frequency using the freq parameter.
At first, import the required libraries −
import pandas as pd
Create a DatetimeIndex with period 7 and frequency as Y i.e. year −
datetimeindex = pd.date_range('2021-10-18 07:20:32.261811624', periods=5, freq='2Y')
Display DateTimeIndex −
print("DateTimeIndex...\n", datetimeindex)
Calculate TimedeltaArray of difference between index values and index converted to PeriodArray. We have set the Period frequency using the "freq" parameter with value 'M' −
print("\nConvert DateTimeIndex to PeriodDelta...\n", datetimeindex.to_perioddelta(freq='M'))
Example
Following is the code −
import pandas as pd # DatetimeIndex with period 7 and frequency as Y i.e. year # timezone is Australia/Adelaide datetimeindex = pd.date_range('2021-10-18 07:20:32.261811624', periods=5, freq='2Y') # display DateTimeIndex print("DateTimeIndex...\n", datetimeindex) # display DateTimeIndex frequency print("DateTimeIndex frequency...\n", datetimeindex.freq) # Convert DateTimeIndex to Period # We have set the frequency as Month using the "freq" parameter with value 'M' print("\nConvert DateTimeIndex to Period...\n", datetimeindex.to_period(freq='M')) # Calculate TimedeltaArray of difference between index values and index converted to PeriodArray # We have set the Period frequency using the "freq" parameter with value 'M' print("\nConvert DateTimeIndex to PeriodDelta...\n", datetimeindex.to_perioddelta(freq='M'))
Output
This will produce the following code −
DateTimeIndex... DatetimeIndex(['2021-12-31 07:20:32.261811624', '2023-12-31 07:20:32.261811624', '2025-12-31 07:20:32.261811624', '2027-12-31 07:20:32.261811624', '2029-12-31 07:20:32.261811624'], dtype='datetime64[ns]', freq='2A-DEC') DateTimeIndex frequency... <2 * YearEnds: month=12> Convert DateTimeIndex to Period... PeriodIndex(['2021-12', '2023-12', '2025-12', '2027-12', '2029-12'], dtype='period[M]') Convert DateTimeIndex to PeriodDelta... TimedeltaIndex(['30 days 07:20:32.261811624', '30 days 07:20:32.261811624', '30 days 07:20:32.261811624', '30 days 07:20:32.261811624', '30 days 07:20:32.261811624'], dtype='timedelta64[ns]', freq=None)