pandas.tseries.offsets.SemiMonthBegin.rollback
- SemiMonthBegin.rollback()
 - 
Roll provided date backward to next offset only if not on offset.
- Returns
 - 
- TimeStamp
 - 
Rolled timestamp if not on offset, otherwise unchanged timestamp.
 
 
 
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    https://pandas.pydata.org/pandas-docs/version/1.3.4/reference/api/pandas.tseries.offsets.SemiMonthBegin.rollback.html