React-Datepicker used inside Formik form and initialized to Date() returns timestamp on selection

[eugeneborodkin]

Describe the bug
I have a Day-based React-Datepicker used inside a Formik form, which may or may not be relevant (I followed this small Formik wrapper). When the React-Datepicker is initialized to a form value that has a timestamp, such as new Date(), then any day selection returns the current timestamp. On the other hand, when it's initialized to something like NULL, any day selection returns 00:00:00. I need zero-time 00:00:00 returned in both of these cases.

To Reproduce
CodeSandBoxIO Demo:
https://codesandbox.io/s/proud-dust-gb25u
In this demo:

1. Datepicker 1 in Formik form initialized to new Date(). Note that any date selection includes the current timestamp in the value.
2. Datepicker 2 in Formik form initialized to NULL. Note that any date selection includes the 00:00:00 timestamp.

Expected behavior
Even if the DatePicker is initialized to a form value of new Date(), it should still return 00:00:00 on any Day selection. Regardless of how it is initialized, the value set by a day-based React-DatePicker such as in this example should always be 00:00:00 (no time, just the date).

[adyz]

This is strange indeed, it's not caused by Formik, I've modified your sandbox and added some datepickers that use state instead on formik and the same happens here also: https://codesandbox.io/s/affectionate-engelbart-sl61c

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.