code: def get_timestamp(
      hour: int, minute: int, second: int, microsecond: int
  ) -> float:
      # Year, month, day don't just need to be filled out consistently.
      dt = datetime.datetime(
          year=2012,
          month=12,
          day=21,
          hour=hour,
          minute=minute,
          second=second,
          microsecond=microsecond,
      )
      return dt.timestamp()
  
file_path: ray/python/ray/tests/test_node_provider_availability_tracker.py
imports: import datetime
  import dataclasses
  import os
  import sys
  import pytest
  from ray.autoscaler.node_launch_exception import NodeLaunchException
  from ray.autoscaler._private.node_provider_availability_tracker import NodeProviderAvailabilityTracker, NodeAvailabilitySummary, NodeAvailabilityRecord, UnavailableNodeInformation
label_desc: Use image node_id 8 for calling a global function with example usage: get_timestamp(hour, minute, second, microsecond) and returns: dt