# ISO Calendar {% hint style="info" %} 💪 **Difficulty:** very easy ⏳ **Time to complete**: approx. 1 minute {% endhint %} ## 💬 Description Our ISO Calendar is probably our most used Connector. It is extremely helpful as it creates a table with daily dates for a period you select. That can be used for almost any analysis (see below). We include the weekday, month number, month, week, quarter and year in the output of this Connector. ## 🤑 Use Case Almost all reporting benefits from understanding how things evolve over time. That means it can be very helpful to join multiple data sources on a specific date. Let’s say you want to do a monthly automated financial report - then you can join all your costs back to the ISO Calendar and group by summarize the costs by the month column. Very helpful! ## 🛠️ Setup This one should be quickly over with! Just input how many years you want to look back in time and how years you wanna look ahead. If the current date is Jan 1st, 2000 and you select 20 years each way, then the first row of data will be Jan 1st, 1980 and the last row will be Jan 1st, 2020. The next day (Jan 2, 2020) the range will be from Jan 2nd, 1980 - Jan 2nd, 2020. In doing so, you never have to maintain the connector as its dynamic to the current 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://resources.less.tech/less-tech/connectors/connector-guides/iso-calendar.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.