# Terminology Date picking is the fundamental of our app, so naturally it would be good if we explain the terminology and talk about how things work. **Number of preparation day**: Amount of time in day needed to prepare. This is the idle time from the point of ordering to the first day of date/time selection **Delivery date range**: The range of day customers can select their order date and time. **Blackout date**: holiday period when you don't work. The app will disable selected dates and push the remaining preparation day(s)/delivery day(s) forward. **Working day**: is defined as the day(s) within the week when you can fulfill customers' orders. You can to set up all 7 days of the week or selected ones only. By default, **non-working day will be counted toward your prep day.** If you don't want to consider non-working day as your prep day, go to **General Settings** and turn on **"Do not include non-working day in prep day".** --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.dingdoong.io/terminology.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.