date -1

datetime.strptime(date.get(), "%Y-%m-%d") - datetime.timedelta(days=1)

'Promise' object has no attribute 'get'

datetime.strptime(date, "%Y-%m-%d") - datetime.timedelta(days=1)

strptime() argument 1 must be str, not Promise

@workflow 
my_workflow(date: str, name: str) -> bool:
      yesterday = str(datetime.strptime(date.get(), "%Y-%m-%d") - datetime.timedelta(days=1))
      my_task(yesterday)

@task
my_task(yesterday: str):
   # task related code

my_task

date

name