# How to create a time aware filter that update when its temporal input changed

**URL:** <https://discourse.vtk.org/t/how-to-create-a-time-aware-filter-that-update-when-its-temporal-input-changed/3859>\
**Category:** Development\
**Created:** [July 28, 2020, 3:23am UTC](https://discourse.vtk.org/t/how-to-create-a-time-aware-filter-that-update-when-its-temporal-input-changed/3859 "2020-07-28T03:23:41Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![sharon](https://discourse.vtk.org/letter_avatar_proxy/v4/letter/s/67e7ee/32.png) [@sharon](https://discourse.vtk.org/u/sharon)\
**Post date:** [July 28, 2020, 3:23am UTC](https://discourse.vtk.org/t/how-to-create-a-time-aware-filter-that-update-when-its-temporal-input-changed/3859/1 "2020-07-28T03:23:41Z")

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Dear All,  
One of my filter’s input is from a temporal reader, how can make filter aware its input changed and update accordingly?

In my case, the reader can read time series files and update correctly, but the filter is not update accordingly…

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**Author:** ![kayarre](https://discourse.vtk.org/user_avatar/discourse.vtk.org/kayarre/32/808_2.png) [@kayarre](https://discourse.vtk.org/u/kayarre)\
**Post date:** [July 29, 2020, 4:23pm UTC](https://discourse.vtk.org/t/how-to-create-a-time-aware-filter-that-update-when-its-temporal-input-changed/3859/2 "2020-07-29T16:23:19Z")

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can you describe the temporal reader you are using?