✨ Add Date & Time node docs

docs/nodes/nodes-library/core-nodes/Date&Time/README.md

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+---
+permalink: /nodes/n8n-nodes-base.dateTime
+---
+
+# Date & Time
+
+The Date & Time node is used to manipulate date and time data and convert it between formats.
+
+::: tip 💡 Keep in mind
+1. Make sure that the timezone is set correctly for the n8n instance (or the workflow).
+:::
+
+## Node Reference
+
+- Action
+	- Convert a date to a different format
+
+You can specify the format that the date has to be converted to from the *To Format* dropdown list.
+
+- To Format
+	- MM/DD/YYYY
+	- YYYY/MM/DD
+	- MMMM DD YYYY
+	- MM-DD-YYYY
+	- YYYY-MM-DD
+	- Unix Timestamp
+	- Unix Ms Timestamp
+
+You can also specify a custom format by setting the *Custom Format* toggle to 'On'.
+
+**Options**
+- **From Format**: Allows you to specify the format of the input values.
+- **From Timezone**: Allows you to specify the timezone of the input values, for input timezones that are different from n8n's system clock.
+- **To Timezone**: Allows you to specify the timezone that the input values have to be converted to.
+
+
+## Example Usage
+
+This workflow allows you to convert a date from one format to another using the Date & Time node. You can also find the [workflow](https://n8n.io/workflows/575) on the website. This example usage workflow would use the following two nodes.
+- [Start](../../core-nodes/Start/README.md)
+- [Date & Time]()
+
+
+The final workflow should look like the following image.
+
+![A workflow with the Date & Time node](./workflow.png)
+
+### 1. Start node
+
+The start node exists by default when you create a new workflow.
+
+### 2. Date & Time node
+
+1. Enter the date that you want to convert in the *Value* field.
+2. Click on the *Add Option* dropdown, click on the *From Format* option, and enter the format of the input date.
+3. Select the format you want to convert it to from the _To Format_ dropdown list.
+4. Click on *Execute Node* to run the workflow.