[Predator] Move time_util from common/ to lib/, split code review related part to code_review_util

appengine/findit/common/time_util.py

-# Copyright 2016 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-import calendar
-from datetime import datetime
-from datetime import time
-from datetime import timedelta
-
-import pytz
-
-
-def GetUTCNow():  # pragma: no cover.
-  """Returns the datetime.utcnow. This is to mock for testing."""
-  return datetime.utcnow()
-
-
-def GetUTCNowWithTimezone():  # pragma: no cover.
-  """Returns datetime.now but in utc timezone. This is to mock for testing."""
-  return datetime.now(pytz.utc)
-
-
-def GetUTCNowTimestamp():  # pragma: no cover.
-  """Returns the timestamp for datetime.utcnow. This is to mock for testing."""
-  return calendar.timegm(GetUTCNow().timetuple())
-
-
-def RemoveMicrosecondsFromDelta(delta):
-  """Returns a timedelta object without microseconds based on delta."""
-  return delta - timedelta(microseconds=delta.microseconds)
-
-
-def FormatTimedelta(delta):
-  """Returns a string representing the given time delta."""
-  if not delta:
-    return None
-  hours, remainder = divmod(delta.total_seconds(), 3600)
-  minutes, seconds = divmod(remainder, 60)
-  return '%02d:%02d:%02d' % (hours, minutes, seconds)
-
-
-def FormatDatetime(date):
-  """Returns a string representing the given UTC datetime."""
-  if not date:
-    return None
-  else:
-    return date.strftime('%Y-%m-%d %H:%M:%S UTC')
-
-
-def FormatDuration(datetime_start, datetime_end):
-  """Returns a string representing the given time duration or None."""
-  if not datetime_start or not datetime_end:
-    return None
-  return FormatTimedelta(datetime_end - datetime_start)
-
-
-def GetDatetimeInTimezone(timezone_name, date_time):
-  """Returns the datetime.datetime of the given one in the specified timezone.
-
-  Args:
-    timezone_name (str): The name of any timezone supported by pytz.
-    date_time (datetime.datetime): The optional datetime to be converted into
-        the new timezone.
-
-  Returns:
-    A datetime.datetime of the given one in the specified timezone.
-  """
-  return date_time.astimezone(pytz.timezone(timezone_name))