Check for previous date set for reminder

[pratistha-05]

When we set reminder, there is no check to not allow user to select past time or dates in date picker. Even after selecting wrong date, the reminder is set without any check to notify user to change the date. Possible solutions can be:

1. Provide restriction to select previous date in date picker
2. Show toast message to user to select appropriate dates
3. show snackbar to let user know reminder cannot be set

[eren8204]

@pratistha-05 can i start working on it

[eren8204]

@federicoiosue hi i have added the functionality of preventing past reminder, can i make pull request now?

[eren8204]

@pratistha-05 @federicoiosue add me as collaborator so that i can contribute

[federicoiosue]

@eren8204 you can open a pull request to be reviewed with no permission requirements on the project itself.

[eren8204]

@federicoiosue i've raised the PR please look into that