6.4. Date Frequency

6.4.1. Offset Aliases

Table 6.12. Offset aliases

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

6.4.2. Date Frequency Units

Table 6.13. Date frequency units

Frequency	Letter	Long name	Short name
Year	Y
Month	M
Week	W
Day	D	day, days
Hour	H	hour, hours	h, hr
Minute	T	minute, minutes	m, min
Second	S	second, seconds	sec
Millisecond	L	millisecond, milliseconds	ms, milli, millis
Microsecond	U	microsecond, microseconds	us, micro, micros
Nanosecond	N	nanosecond, nanoseconds	ns, nano, nanos