Impressed on the tool you are developing and hopeful soon it will meet the business needs.
I got an idea to might be useful in your use case, it came forward from this post:
The technique used by @shishir, solving step my step the challenge is very helpful and makes it more easy to understand
In my use case I need the months to be extracted, in your use case you could extract the days or hours equipment is rented out and offering certain benefits to the clients that can drive your business.
Example: Day price is X Euro, when renting more then Y days you get Z% discount on the days >= 3
Or repeating clients, to receive a discount after the annual sum of X days rented equipement.
Success and have a good week ahead,
//JP
PS. I _have been in Lithuania several times inspecting facilities producing apparel and had the chance to see the beautiful countryside and Vilnius.