def convert_cube_time_coord_to_standard_time_assuming_gregorian_calendar(cube):
"""Converts the time coordinate from the one in the cube to one based on a standard time unit.
This approach assumes that source date is valid as a date in the calendar set for the
standard time unit (Gregorian) which will not always be true.
:param cube: cube to modify
:return: the cube
"""
# Get the current time coordinate and it's data dimension
t_coord = cube.coord(standard_name='time')
data_dim = cube.coord_dims(t_coord)
# And remove it from the cube
cube.remove_coord(t_coord)
# Convert the raw time numbers to our 'standard' time
new_datetimes = convert_numpy_array(t_coord.points, 'O', t_coord.units.num2date)
new_datetime_nums = convert_obj_to_standard_date_array(new_datetimes)
# Create a new time coordinate by copying the old one, but using our new points and units
new_time_coord = t_coord
new_time_coord.points = new_datetime_nums
new_time_coord.units = cis_standard_time_unit
# And add the new coordinate back into the cube
cube.add_dim_coord(new_time_coord, data_dim)
return cube
def parse_datetimestr_to_std_time_array(string_time_array):
from utils import convert_numpy_array
return convert_numpy_array(string_time_array, "float64", parse_datetimestr_to_std_time)
def convert_obj_to_standard_date_array(time_array):
return convert_numpy_array(time_array, 'float64', convert_datetime_to_std_time)
def convert_julian_date_to_std_time_array(julian_time_array, calender='standard'):
return convert_numpy_array(julian_time_array, 'float64', convert_julian_date_to_std_time, calender)
def convert_sec_since_to_std_time_array(tai_time_array, ref):
return convert_numpy_array(tai_time_array, 'float64', convert_sec_since_to_std_time, ref)
