Error Checking Between Two Dates

Configuration Frontend
1

Is it possible to error check in a Lovelace UI?

I’ve set up two input.datetime helpers that are being used to identify the start and end date of a vacation period. Users select the desired dates, start and finish, from an entities card on a Lovelace panel. In turn these dates are used to changes how various entities in the house function.

I foresee a situation where a user could input a start date that is later than an end date. Or vise versa. Is there anything I can do from a coding perspective to alert users to this type of error and to ensure the end date of the selected vacation period is always later than the selected start date?

2

you could set up an automation to trigger an alert or notification depending on the values of the datetimes.

or use a conditional markdown card that pops up depending on the state of a binary sensor tht checks that one date is later than the other.

3

These are two great ideas! Never though about using a conditional markdown card. I give these a try over the weekend.

Thank you