If I put any type of date (05.05.2017, 05/05/2017, May 5 2017, 5 May 2017) in edit task it doesn't store when I press Save and if I click Edit task one more there is no date specified again.
The date field in To-Do bot's edit form should show a date picker when you click into it (see https://s3.amazonaws.com/uploads.hipchat.com/6/1712371/sUqlYnM0q41yNJy/HipChat%202017-02-24%2017-05-28.png). I believe you need to use the picker in order to properly change the date.
To-Do bot is a 3rd party addon, so if you need to request features or report bugs, I would recommend using the feedback form found in the bottom of the sidebar when you open it in HipChat. Hopefully the maintainer will get back to you or let you know if there are any tricks that can be used for manual entry.
...from the beginning. We have built up a lot of content in HipChat, with it being a core tool in our distributed company model. While it is true that we didn’t need to move to Slack immediately, we felt it...
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