Require Cells Between Two Values to be Filled with "1"

Hi I would like some assistance regarding the following

Where A1 will equal "1" and A15 will equal "1" - I require every cell in between the two to be filled with a "1".

My aim is to apply this to a small base of data and to conditional format the "1" so that at a glance I can sum the total amounts of rows and associated 'blocks'

Re: Require Cells Between Two Values to be Filled with "1"

Attached the excel file; I am using this as a tool to check shifts on a roster

Re: Require Cells Between Two Values to be Filled with "1"

Thanks very much for the prompt assistance, I can't upload the file so will have to explain in more detail

I have in C1; The time of day in 15 minute blocks (0015/0030/0045 etc)
I have in column A/B; shift start times and finish times plotted against the time data in row 1 using an IF formula to return a "1" where the shift time matches the top row

What I would like to achieve is for every instance where there is a "1" followed by blanks and the closing "1" - I would like to fill the values between the two values with more "1's"

Example Row 1: 0500/0515/0530/0545/0600
Example Column A:B: 0500 start and 0600 finish
Example Matched Result: 1,blank,blank,blank, 1
Required Outcome: 1,1,1,1,1

Outside of where there is a genuine blank cell - I would like this to remain blank, only fill cells between two "1" values. Its a challenging one!

Thanks in advance

Re: Require Cells Between Two Values to be Filled with "1"

So I have managed to upload the file - which I hope will help solve the challenge I am facing!

I hope that the actual data makes finding a solution easier, all I really want is for the 1's that are on the same row to be linked by a colour (refer attachment example). Was under the impression that I needed conditional formatting - but this doesn't exactly work!

Thanks in advance all!

Cheers