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This function converts the string representation of the timestep to its corresponding numeric value or returns the numeric input (if it is a whole number). For "day", "week", it returns 1 and 7 respectively. For "month", it returns "month" as months are not a fixed number of days. If the input is a numeric whole number, it is returned as is.





The timestep to used. This can be a string ("day", "week", "month") or a numeric whole number representing the number of days.


A numeric value representing the number of days for "day" and "week", "month" for "month", or the input value if it is a numeric whole number.