Hey kraeMit… the issue has to do with Safari and how it handles the type of code being utilized by the date field being generated by Contact Form 7 that allows for a dropdown calendar, etc. For some reason, they have chosen to not update the Safari browser to handle this and, as a result, it cause the whole form to not work.
To solve the problem in the short term, the simplest way is to change the “date” field to be a text field (as opposed to using Contact Form 7’s “date” field selection) and put in the placeholder area the format you wish it entered (i.e. dd/mm/yyyy or mm/dd/yyyy or…), that way when people use the form they will enter the data as you want it.
Once you do this, your form should work. To have Contact Form 7 work across all browsers platforms you will just want to stay away from some of their selections that generate certain dropdowns. It may be trial and error as to which ones work and which ones don’t, but for sure the date one does not at this time.