Systems and methods for presenting calendar information in electronic messages can include a data processing system receiving a request for calendar information for display in an electronic message responsive to the client device accessing the electronic message. The data processing system can identify, using information in the request, the calendar information of the sender of the electronic message and calendar information of the recipient of the electronic message. The data processing system can retrieve the calendar information of the sender of the electronic message and the calendar information of the recipient of the electronic message. The data processing system can automatically generate an image depicting the calendar information of the sender of the electronic message and the calendar information of the recipient of the electronic message, and send instructions to the client device to cause display of the image within the electronic message accessed by the client device.