custom module¶

`add_xl_formula`(df[, column_name, formula, …])	add Excel (xl) formula column
`duration`(s1[, s2, unit, round, freq])	calculate duration between two columns (series)
`factorize`(series[, categories, ordered])	factorize / make column a categorical dtype
`fiscal_year`(date[, start_month, year_only])	Convert to fiscal year
`from_excel`(excel_date)	apply_date function: excel serial date -> pd.Timestamp
`from_julian`(julian[, jde_format])	apply_date function: (JDE) Julian -> Gregorian
`ratio`(value1, value2[, precision, percent, …])	Calculate the Ratio / percentage of two values
`to_julian`(greg_date[, format])	apply_date function: Gregorian -> (JDE) Julian