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https://issues.apache.org/jira/browse/AIRFLOW-1737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16479134#comment-16479134
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Josh Temple commented on AIRFLOW-1737:
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Confirmed, also experiencing this bug.
> set_task_instance_state fails because of strptime
> -------------------------------------------------
>
> Key: AIRFLOW-1737
> URL: https://issues.apache.org/jira/browse/AIRFLOW-1737
> Project: Apache Airflow
> Issue Type: Bug
> Components: webapp
> Reporter: Andre Boechat
> Priority: Minor
> Attachments: Screenshot_2017-10-18_15-58-29.png
>
>
> Context:
> * DAG run triggered manually
> * Using the web application to change the state of a task
> When trying to set the state of a task, an exception is thrown: *ValueError:
> unconverted data remains: ..372649* (look at the attached screenshot).
> I think the problem comes from the "execution date" created by manually
> triggered DAGs, since the date-time includes a fractional part. In my
> database, I see scheduled DAGs with execution dates like "10-18T15:00:00",
> while manually triggered ones with dates like "09-21T16:36:16.170988". If we
> look at the method *set_task_instance_state* in *airflow.www.views*, we see
> that the format string used with *strptime* doesn't consider any fractional
> part.
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