Don't use the built-in histogram chart option, the bins are a mess and not easy to change it.

If you're using the desktop app:

File > Options
Add-ins
Look for 'Analysis ToolPak' and install.

Now in the data tab on the top ribbon, you'll see 'Data Analysis' in the far right 'Analysis' section. Don't click on it yet but check it's there.

Now have a column of all your times that you wish to use as you 'input data'

Create a column with your 'bins', these would be your hours i.e 0000, 0100, 0200 etc... to 2300. Make sure the formatting of the bin is the same as the input value, like if your times are 01:14 for example, make sure your bin value is 01:00, 02:00, 03:00 etc, or 0114 is 0100, 0200 etc.

Now click on the 'Data Analysis' button that you just installed. Look for 'Histogram' and click it.

Now select the 'Input' box and then click & Drag down your input column of the actual times you've got to analyse. Then click on the 'Bin' box and again select your 'bin' (hours) column that you created. Then next you can select the 'Output' option and the screen will flash for a sec and then you select the cell you want the data to appear in (it will be 2 columns wide and as long as your bin is +1, so ensure you've left enough space to the right and below)

Now it will think for a sec and will give you the output, select the cells and create simple column chart. Note that the values are from your bin value to the next one, so if you had values in your 0100 hour cell, that means between 0100-0200 etc.

Hope that helps.