old_contents: import pkg_resources
  
  from heatherr import celery_app
  from heatherr.models import SlackAccount
  
  
  @celery_app.task(ignore_result=True)
  def check_all_checkins():
      slackaccounts = SlackAccount.objects.all()
      for slackaccount in slackaccounts:
          check_slackaccount_checkins(slackaccount)
  
  
  def check_slackaccount_checkins(slackaccount):
      users = slackaccount.get_users()
      requireds = [checkin
                   for checkin in slackaccount.checkin_set.all()
                   if checkin.required(users=users)]
      for checkin in requireds:
          check_checkin(checkin)
  
  
  def check_checkin(checkin):
      user_channel_id = checkin.get_user_channel_id()
      slackaccount = checkin.slackaccount
      return slackaccount.api_call(
          'files.upload',
          channels=user_channel_id,
          initial_comment=(
              "Hey! Gentle reminder to send your %s update to let your <#%s|%s> "
              "team know what been busy with. Here's a template to help you "
              "get started. Type `/checkin remove %s` if you want me to stop "
              "sending this reminders. Type `/checkin list` to see all checkins"
              " set.") % (
                  checkin.interval,
                  checkin.channel_id,
                  checkin.channel_name,
                  checkin.pk),
          filetype='post',
          title='%s check-in',
          content=pkg_resources.resource_string(
              'heatherr.checkin',
              'templates/checkin-%s-template.txt' % (checkin.interval,))
      )
  
new_contents: import pkg_resources
  
  from django.utils import timezone
  
  from heatherr import celery_app
  from heatherr.models import SlackAccount
  
  
  @celery_app.task(ignore_result=True)
  def check_all_checkins():
      slackaccounts = SlackAccount.objects.all()
      for slackaccount in slackaccounts:
          check_slackaccount_checkins(slackaccount)
  
  
  def check_slackaccount_checkins(slackaccount):
      users = slackaccount.get_users()
      requireds = [checkin
                   for checkin in slackaccount.checkin_set.all()
                   if checkin.required(users=users)]
      for checkin in requireds:
          check_checkin(checkin)
  
  
  def check_checkin(checkin):
      user_channel_id = checkin.get_user_channel_id()
      slackaccount = checkin.slackaccount
      response = slackaccount.api_call(
          'files.upload',
          channels=user_channel_id,
          initial_comment=(
              "Hey! Gentle reminder to send your %s update to let your <#%s|%s> "
              "team know what been busy with. Here's a template to help you "
              "get started. Type `/checkin remove %s` if you want me to stop "
              "sending this reminders. Type `/checkin list` to see all checkins"
              " set.") % (
                  checkin.interval,
                  checkin.channel_id,
                  checkin.channel_name,
                  checkin.pk),
          filetype='post',
          title='%s check-in',
          content=pkg_resources.resource_string(
              'heatherr.checkin',
              'templates/checkin-%s-template.txt' % (checkin.interval,))
      )
      checkin.last_checkin = timezone.now()
      return response
  
subject: update timezone