Reporting - Create Date Required Filter range options

[James-Preseem]

I am looking to create a chart that tracks tickets over a period of time between 1 quarter and 1 year.

Currently the only options I have for Create date

'is this' are 

• Month
• Quarter so far 
• Quater 'The current quarter` ;I fail to see how this is different than quarter so far
• year so far
• year 'the current calenard year`; again, how is this different than year so far?

'is last' options are

• week
• month
• quarter
• year
• 7 days 'previous 7 days'
• 14 days 'previous 14 days'
• 30 days 'previous 30 days'
• 60 days 'previous 60 days'
• 90 days 'previous 90 days'
• 365 days 'previous 365 days'

pretty much every other option aside from 'is all time' requires me to add a static date to establish a range.

I would like to be able to specify a create date range that is one of the following

• a specified number of trailing days, weeks, or months i.e. of my choosing.  This could come in the form of additional preset values for the 'is' option
  • Is options
    • Week so far
    • Quarters: 1, 2, 3
    • Months: 1,3,6
  • Is last options
    • Quarters: 1, 2, 3
    • Months: 1,3,6
    • Weeks 1,2,3
    • Days 1,2,3,4,5,6
    • OR simply give the option to specify the quantity and time frame
      • 3 quarters
      • 5 week
      • 13 days

I am looking to show a trailing graph over the past 6 months and only have the option of last quarter or the entire year as a data set and have no way to do it at this point.