show correct duration on graph view for running task (#8311) (#8675)
show correct duration on graph view for running task (#8311) (#8675)

* show correct duration on graph view for running task (#8311)

* fix invalid end date  (#8311)

* Update airflow/www/static/js/task-instances.js

Co-authored-by: Ash Berlin-Taylor <c98219fa5869fa00c16554b67c9fb7547acd11f2@firemirror.com>

Co-authored-by: Ash Berlin-Taylor <c98219fa5869fa00c16554b67c9fb7547acd11f2@firemirror.com>
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