datatable.time

day()	Return day component of a date.
day_of_week()	Compute day of week for the given date.
hour()	Return hour component of a timestamp.
minute()	Return minute component of a timestamp.
month()	Return month component of a date.
nanosecond()	Return nanosecond component of a timestamp.
second()	Return the number of seconds in a timestamp.
year()	Return year component of a date.
ymd(y,m,d)	Create a date32 column from year, month, and day components.
ymdt(y,m,d,H,M,S)	Create a time64 column from year, month, day, hour, minute, and second components.