Custom order form script help...Please??

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Hi Everyone. I wonder if anyone can give me some help/guidance with a script I use on a C5 website. The used a combination of 2 scripts to get the result I needed. Firstly I needed a date time script and needed to combine this with a calculating order form which can be found at https://ironing-cirencester.co.uk/book-ironing/...
I use the above page for input of collection/delivery dates and times, which then forwards to the calculating order form. I would like to do this on one page but am struggling with the script. I have to admit that I'm not very good with this! I have spent weeks on end trying this and that, but to no avail.
I have managed to get my form working, as can be found at https://ironing-cirencester.co.uk/test3...
The problem is this: It works perfectly in Chrome, but not in Firefox, Internet Explorer etc. I believe it's a problem with HTML5, but don't have a clue how to apply a remedy. Any help or advice would be appreciated. I have attached the code I use for this form.

Best wishes,
Margaret

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MagsAtWcg