Here's an "assist"...
Skip was right about the need to use: Edit - Paste Special - Values ... to convert the formula to a "fixed" value.
While Skip's formatting suggestions are accurate, when copying a formatted date formula and converting it to a value, the result will still be a value - like the one Skip already provided... 37868.6481980324. And I'm sure it's not a NUMBER that you want.
Here are a couple of formulas as options. When they are copied and converted to values, they will stay fixed as TEXT.
1) =TEXT(NOW(),"mmmm dd, yyyy"
2) =TEXT(NOW(),"mmmm dd, yyyy - hh:mm"
A problem with the hour:minutes above, is that it's military time - i.e. 24 hour clock. Thus, the only way the end-user can be assured the hour:minutes is based on military time, is if the hour:minutes is beyond 13:00.
With any hour:minutes up to 13:00, the user could interpret this to be EITHER AM or PM, for example 12:35 AM or 12:35 PM.
3) While the following formulas are rather "lenghty", they do afford some flexibility. I normally place the formula on a SEPARATE page, and then reference it via formula.
3a) This one displays the hours:minutes, followed by "a.m." or "p.m.", followed by the Month, Day and Year.
=" "&RIGHT(" "&FIXED(IF(HOUR(NOW())=0,12,IF(HOUR(NOW())>12,HOUR(NOW())-12,HOUR(NOW()))),0,TRUE),2)&":"&RIGHT("00"&FIXED(MINUTE(NOW()),0,TRUE),2)&IF(HOUR(NOW())<12," a.m."," p.m."

&" "&CHOOSE(MONTH(NOW()),"January","February","March","April","May","June","July","August","September","October","November","December"

&" "&RIGHT("00"&FIXED(DAY(NOW()),0,TRUE),2)&", "&FIXED(1900+(YEAR(NOW())-1900),0,TRUE)
3b) This one is the same as above, execpt that the hour:minutes come AFTER the Month, Day and Year.
=CHOOSE(MONTH(NOW()),"January","February","March","April","May","June","July","August","September","October","November","December"

&" "&RIGHT("00"&FIXED(DAY(NOW()),0,TRUE),2)&", "&FIXED(1900+(YEAR(NOW())-1900),0,TRUE)&" "&RIGHT(" "&FIXED(IF(HOUR(NOW())=0,12,IF(HOUR(NOW())>12,HOUR(NOW())-12,HOUR(NOW()))),0,TRUE),2)&":"&RIGHT("00"&FIXED(MINUTE(NOW()),0,TRUE),2)&IF(HOUR(NOW())<12," a.m."," p.m."
When I place the formula on a SEPARATE sheet, I assign a range name to the formula - e.g. "date_". Then, when I reference the formula at the top of a report, for example, I will use a formula like: ="Printed: "&date_
I hope this helps.
Regards, ...Dale Watson dwatson@bsi.gov.mb.ca