Time Operations

def time.year(x):
    """Extract year component from datetime"""

def time.month(x):
    """Extract month component from datetime"""

def time.day(x):
    """Extract day component from datetime"""

def time.hour(x):
    """Extract hour component from datetime"""

def time.minute(x):
    """Extract minute component from datetime"""

def time.second(x):
    """Extract second component from datetime"""

def time.nanosecond(x):
    """Extract nanosecond component from datetime"""

def time.day_of_week(x):
    """Extract day of week (0=Monday, 6=Sunday)"""

def time.ymd(year, month, day):
    """
    Create date from year, month, day components.
    
    Parameters:
    - year: Year values
    - month: Month values (1-12)
    - day: Day values (1-31)
    
    Returns:
    Date column
    """

def time.ymdt(year, month, day, hour=0, minute=0, second=0):
    """
    Create datetime from components.
    
    Parameters:
    - year: Year values
    - month: Month values (1-12)
    - day: Day values (1-31)
    - hour: Hour values (0-23, default 0)
    - minute: Minute values (0-59, default 0)
    - second: Second values (0-59, default 0)
    
    Returns:
    Datetime column
    """

import datatable as dt

# Create datetime data
DT = dt.Frame({
    'datetime_str': ['2023-01-15 14:30:45', '2023-06-22 09:15:30', '2023-12-31 23:59:59']
})

# Convert to datetime and extract components
result = DT[:, dt.update(
    datetime_val=dt.as_type(f.datetime_str, dt.time64),
    year=dt.time.year(dt.as_type(f.datetime_str, dt.time64)),
    month=dt.time.month(dt.as_type(f.datetime_str, dt.time64)),
    day=dt.time.day(dt.as_type(f.datetime_str, dt.time64)),
    hour=dt.time.hour(dt.as_type(f.datetime_str, dt.time64)),
    minute=dt.time.minute(dt.as_type(f.datetime_str, dt.time64)),
    day_of_week=dt.time.day_of_week(dt.as_type(f.datetime_str, dt.time64))
)]

# Construct dates from components
dates = dt.Frame({
    'year': [2023, 2023, 2023],
    'month': [1, 6, 12],
    'day': [15, 22, 31]
})

dates_result = dates[:, dt.update(
    date_val=dt.time.ymd(f.year, f.month, f.day),
    datetime_val=dt.time.ymdt(f.year, f.month, f.day, 12, 0, 0)
)]