Class Now

django/db/models/functions/datetime.py:213–241

class Now(Func):
    template = "CURRENT_TIMESTAMP"
    output_field = DateTimeField()

    def as_postgresql(self, compiler, connection, **extra_context):
        # PostgreSQL's CURRENT_TIMESTAMP means "the time at the start of the
        # transaction". Use STATEMENT_TIMESTAMP to be cross-compatible with
        # other databases.
        return self.as_sql(
            compiler, connection, template="STATEMENT_TIMESTAMP()", **extra_context
        )

    def as_mysql(self, compiler, connection, **extra_context):
        return self.as_sql(
            compiler, connection, template="CURRENT_TIMESTAMP(6)", **extra_context
        )

    def as_sqlite(self, compiler, connection, **extra_context):
        return self.as_sql(
            compiler,
            connection,
            template="STRFTIME('%%%%Y-%%%%m-%%%%d %%%%H:%%%%M:%%%%f', 'NOW')",
            **extra_context,
        )

    def as_oracle(self, compiler, connection, **extra_context):
        return self.as_sql(
            compiler, connection, template="LOCALTIMESTAMP", **extra_context
        )


class TruncBase(TimezoneMixin, Transform):