End Date Default

In any of the date fields it would be very nice if the End Date defaulted to the same as the Start Date if the start date is changed. For example if I enter a start date of 07/01/2019 it would be great not to have my end date appear as today and then need to click it a lot or even (shudder) manually enter the desired date.
Just a little thing but it would effect data entry that goes over and over and over the same thing.

Yep, this is a good one. We need to standardize the different pickers we use and add that feature.

Great
While at it you might want to see if you can implement the Quicken / Quickbooks protocols for date shortcuts
I will bet there might even be code on the internet - maybe Intuit will give you the code
https://help.quickbooks.intuit.com/en_US/kb/keyboard-shortcuts-quickbooks-desktop-functions/000008231_en_US:SALESFORCE.modal

+ Advance to the next day
- Previous day
T Today
W First day of the Week
K Last day of the Week
M First day of the Month
H Last day of the Month
Y First day of the Year
[ (left bracket) Same day in previous week
] (right bracket) Same day in next week
; (semi colon) Same date last month
' (apostrophe) Same date next month
Alt+Down arrow (↓) Opens the calendar for date selection (the small date calendar, not the “Calendar” feature)