QB Issue Resolution:

Short answer is no, you can not get that done in QB

a memorized transaction is static, and can not change based upon any criteria, unless you manually change it prior to send it

QB does not accept embedded macro’s at all, nor do the fields on any form allow for an excel type formula

Resolution for Issue 'I have recurring transactions that I send out every month. In the description field, I would like to have it state what days the invoice covers.' available: Yes (Solved).
Source: Intuit Community forum.

I have recurring transactions that I send out every month. In the description field, I would like to have it state what days the invoice covers.: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for Description field
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Error Recovery for Description field [Canada]
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