Canon Ixus 850 IS

The date and time (and a lot more) are stored with every picture in its EXIF metadata. Any photo viewing/editing program should be able to display this data. To print this data, please consult the documentation for whatever program you're using to print your pictures. Depending on the program and printer you may print the date on the image, in the margins, or on the back.

Using the Capture Menu
The Capture Menu allows you to adjust camera settings that affect the characteristics
of the images and video clips you capture.
1. While in Live View or Playback, press , then use to highlight .
2. Use to highlight a menu option, then press to display the menu option's
sub-menu.
3. Use to highlight a setting, then press .
4. Press to exit the Capture Menu.
For on-camera information about an option, use to highlight Help... in the option's
sub-menu, then press .

In the capture menu goto

Date & Time Imprint Imprints date in lower left corner of image.
Off Default No date or time imprinted on the image. (this setting)
Date Only Date permanently imprinted.
Date & Time Date and time permanently imprinted.

this should fix your problem

The camera only stamps the date on the pictures when in postcard mode. When in any of the bigger image modes it won't deface your photos by scrawling a string of numbers across them. However the date and time (and a lot more) are stored with every image in its EXIF data. If you want this printed, please consult the documentation for whatever program you're using to print your photos. Depending on the program and printer, you may print this information on the image, in the margins, or on the back.

You will probably find that this not possible. The date and time are recorded in the EXIF information with each photograph all the time but not actually in the picture at all.

:
The date and time can be included on the pictures taken only with the camera in postcard mode. You must also activate the date stamp option in the menu.
To set the camera into postcard mode, press the [Func.] button on the camera, then use the [arrow down] key to go down to the last option in the menu, and there you can choose the [Postcard mode]. Press [Func.] again to exit the function menu.
To set the date and time stamp, press the [Menu] button and then use the [arrow down] button to go to the [Date stamp] option in the menu. You can set this to "Date" or "Date & Time". Press the [Menu] button again to exit the menu.
Be aware that if you take pictures with this option enabled, the Date and Time cannot be removed from the pictures at a further time. It will permanently appear on the picture.

Please rate my help++++Thanks for using FIXYA

You didn't specify the model, so it's only a guess as to what you may need to do. The most common resolution is to check to see what size you have selected (L, M1, M2, S, postcard). For compact Canon cameras that came out two to three years ago, the size had to be set to 'postcard' in order to get the date stamp imprinted on the picture.

I found the instruction manual!

Set the image size to 'postcard'. Press the Function key, scroll down to the bottom icon and select postcard (L, M1, M2, S, postcard). Press Function key again.

To turn the date imprint on, go to the Record menu and set the option for Date Stamp to Date or Date & Time.

The date and time (and a lot more) are stored with every picture in its EXIF metadata. Any photo viewing/editing program should be able to display this data. To print this data, please consult the documentation for whatever program you're using to print your pictures. Depending on the program and printer you may print the date on the image, in the margins, or on the back.

If it prints at all it will be part of the image. But will it? Not all camera have this function and only your camera manual will tell you if your does[there is a more comprehensive manual on the supplied CD]