All of these functions are available from the django.contrib.postgres.functions module.
Returns the date and time on the database server that the current transaction started. If you are not in a transaction it will return the date and time of the current statement. This is a complement to django.db.models.functions.Now, which returns the date and time of the current statement.
Note that only the outermost call to atomic() sets up a transaction and thus sets the time that TransactionNow() will return; nested calls create savepoints which do not affect the transaction time.
>>> from django.contrib.postgres.functions import TransactionNow >>> Article.objects.filter(published__lte=TransactionNow()) [<Article: How to Django>]