Can't get date and time stamp to show up on picture

To set the date and time on your camera, follow these steps:

Turn on the camera and set the language and date/time by following the instructions in the Extended User Manual.
Once you have set the date and time, you can turn on the Date Stamp feature by following the instructions in the User Manual . The date and time will be stamped on all pictures taken with this feature enabled.
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Turn on the [Date Stamp] setting in the [Rec] menu. See page 83 of this manual.

The AVCHD file contains the time date stamp as subtitle track. Any player that can show subtitles can show the time/date stamp (I use Videolan Player).

Usually, after downloading the avchd files to my computer, i do an OCR on the sub file and convert it to .srt, as well as conver the avchd into .mkv and include teh subtitle file into it.

In playback mode, press DISP/BACK to select a playback display format. This will turn the Information display on, which will show you the date/time the picture was taken.

This camera does not have a Time/Date Stamp that actually stays on the picture like some cameras do. Instead, the Time/Date Stamp is included in the Image File Properties, and can be viewed or modified from any Windows PC.

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

The date and time (and a lot of other information) is always stored with the picture file in what's called the EXIF data. By default this is not shown on top of the image since neither the camera nor any photo viewing program knows which portion of your photograph is unimportant and can be obscured by this data.

Any photo editing program should be able to show you this data, probably in a separate window. Most photo printing software likewise can print this data, either on top of the picture or in the margins or on the back. Please refer to the documentation for whatever program(s) you're using.

Only if the date and time stamp was used while the pictures were being taken and appear on the pictures when previewed

Well, not really a solution. More like clarification.
Olympus does not provide a date/time stamp on pics taken with this camera (f310/x840), so, no solution, just knowledge....

The best way to add date/ time stamp to your photo is to use watermark software like Bitwar Watermark Expert.
Add Watermark
So users need to download and install the best watermark software on the computer system first. Then, users can choose Watermark Photo or Watermark Video tool based on the required file format but the steps below will show how to add watermark to photo:
Step 1: Choose the Watermark Photo tool and upload the Image file into the software.
Step 2: Choose Add Text to add text watermark or Add Image to add image watermark to the picture.
Step 3: Type in the Text into the textbox as text watermark and edit the watermark by editing the Font, Size, Rotate, Opacity, and Position. Besides, browse the Image to insert as image watermark and edit the image through the Size, Rotate, Opacity, and Position.
Step 4: After finish editing the watermark, click Apply to start the conversion.
Step 5: When the conversion is complete, tap on Open Path to preview the new photo.

Is there a way to select a group of pictures on the camera and give them all the same date and/or time stamp?
No
Each JPG will show the date on which it was taken, but not on the photo, it will show it on your computer under the column "date picture taken"

One reason why the date stamp is not showing would be that you have not set the system date/time. The date/time resets everytime you take out the battery. Please go to this link and download the userguide... http://alpha02u.c-wss.com/inc/ApplServlet?SV=WWUCA900 file name : PSS500IXUS500CUG-EN.pdf ...Go to page 26 which will tell you how to set the date/time and then go to page 109,113 for the date/time to be displayed on the photographs. Please tell me if this helps