Vous pouvez le trouver appelé Alias de décalage :
Un certain nombre d'alias de chaîne sont attribués à des fréquences de séries chronologiques communes utiles. Nous appellerons ces alias des alias décalés.
Alias Description
B business day frequency
C custom business day frequency
D calendar day frequency
W weekly frequency
M month end frequency
SM semi-month end frequency (15th and end of month)
BM business month end frequency
CBM custom business month end frequency
MS month start frequency
SMS semi-month start frequency (1st and 15th)
BMS business month start frequency
CBMS custom business month start frequency
Q quarter end frequency
BQ business quarter end frequency
QS quarter start frequency
BQS business quarter start frequency
A, Y year end frequency
BA, BY business year end frequency
AS, YS year start frequency
BAS, BYS business year start frequency
BH business hour frequency
H hourly frequency
T, min minutely frequency
S secondly frequency
L, ms milliseconds
U, us microseconds
N nanoseconds
pd.tseries.offsets.__all__
Vous pouvez voir toutes les timedeltas valides ici: pandas.pydata.org/pandas-docs/version/0.23.4/generated/…