Shipping Countdown Timer and Ship Date

I need what I think is a basic (could be wrong) snippet of HTML/javascript that I’m having trouble finding online. Here’s what it should say on the webpage: “Order within [Days] days, [Hours] hours and [Minutes] minutes to receive it on [Date]” or, when there's < 24 hours remaining in the countdown: “Order within [Hours] hours and [Minutes] minutes to receive it on [Date]” or when < 1 hour remains in the countdown: “Order within [Minutes] minutes to receive it on [Date]” [Days], [Hours], [Minutes] = combine to form a countdown showing the amount of time remaining until the next instance of [Time] occurs on a weekday [Time] = variable that specifies a specific time of day, that can be changed. The time should be universal, so that no matter what time zone you’re viewing the webpage from, the countdown time remaining is the same. [Date] can remain the same regardless of time zone. [Date] = The date in which the next instance of [Time] occurs on a weekday + [Transit Days] weekdays ahead (no Saturday and Sunday). Date format example: Monday, July 5, 2017 [Transit Days] = a variable that specifies number of days, which can be changed, i.e. 1, 2, 3 etc. 4 EXAMPLES: in all examples, let the [Time] variable equal 2 PM and the [Transit Days] variable equal 3... (a) If I'm viewing the page at 10:30 AM on Monday, July 17, 2017, the code should produce: Order within 3 hours and 30 minutes to receive it on Thursday, July 20, 2017 (b) If I'm viewing the page at 1:45 PM on Monday, July 17, 2017, the code should produce: Order within 15 minutes to receive it on Thursday, July 20, 2017 (c) If I'm viewing the page at 2:30 PM on Monday, July 17, 2017, the code should produce: Order within 23 hours and 30 minutes to receive it on Friday, July 21, 2017 (d) If I'm viewing the page at 4:00 PM on Friday, July 21, 2017, the code should produce: Order within 2 days, 22 hours and 0 minutes to receive it on Thursday, July 27, 2017