Converting a time string to a time64 using python (better methods exist in pyarrow >= 6.0.0, or use pandas)

time_str_to_time64.py

import pyarrow
from datetime import datetime

start = datetime.strptime("00:00", "%H:%M")
time = datetime.strptime("12:15", "%H:%M")

delta = time - start
us = int(delta.total_seconds() * 1000000)
print(pyarrow.array([us], type=pyarrow.int64()).cast(pyarrow.time64('us')))
# <pyarrow.lib.Time64Array object at 0x7f0b7acad160>
# [
#   12:15:00.000000
# ]