Date and time disappear - Sony Cyber-shot DSC-T20 Digital Camera

try this link below
http://assets.timex.com/manuals/?timexBrand=core

It's a mechanical movement and takes time, to fall into place ,

Canon A520 have CR1220 battery as memory backup power. Replace it. It's located at left hand side there is grey rubber cap open it, you will find one more small flap at bottom, gently pull out straight you will see a battery holder remove CR1220 battery replace same type with new one. Normally it lasts for 3 years.

The date and time (and a lot more) are automatically 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.

You can't display the date and time on the pictures of the digital cameras. The date and time is stored on the file information.
You will have to get some software to do this.
I am using Gena photo stamper to do this task.

For the Amritron 45/6975:
From the "Time Telling Mode" (date/time displayed): to set the date and time: Press "reset" unit the date disappears--release; press "mode", the "hour" will flash, press "st/stp" to adjust hour; press "mode", the "minute" will flash, press "st/stp" to adjust minute; continue same sequence to adjust date; when done, press "reset"---compliments of Gene Lawson

Is the light on your intercom red? Almost like the phone isnt hanging up. There is no way to disable the time on the display. Have you tried a new phone?

For the Amritron 45/6975:
From the "Time Telling Mode" (date/time displayed): to set the date and time: Press "reset" unit the date disappears--release; press "mode", the "hour" will flash, press "st/stp" to adjust hour; press "mode", the "minute" will flash, press "st/stp" to adjust minute; continue same sequence to adjust date; when done, press "reset"

You should be able to hit the Menu button, then the arrow directly below the TmDay display and then hit exit once the date and time are displayed. The date should disappear but the time should stay.

There may be a simple explanation. Here are two possible reasons this is happening: * You may have disconnected the power source before turning off the power to your camcorder. If you remove the power source from the camcorder while the power is on, all settings and selections will be erased. Make sure to turn the camcorder's power off before disconnecting the power source. * This is particularly an issue for some early VHS-C camcorders – those with model numbers beginning with a "6" and ending with a "2" or "3" (i.e. CC6xx2 … CC6xx3). These camcorders have a consumer-replaceable clock battery that may be exhausted. If that battery runs dead or is removed and the main battery or AC is not connected, the camcorder will lose all its Date and Time settings. * In some models, the date and time display is designed to do this. When you turn on many VHS-C and digital camcorders, the Auto Date mode will display the time and date. When recording begins, the date is recorded on the tape for 5 seconds and then disappears. In the viewfinder, the date will then be replaced with the words AUTO DATE but they will not be recorded. They remain in your viewfinder so that you know this feature is on. On full-size or VHS camcorders, the Auto Date feature is very similar. When you first turn on the camcorder, the date along with the word AUTO and a Clock icon appear in the viewfinder. When recording begins, the date is automatically recorded for 10 seconds and then disappears. In the viewfinder, the Clock icon and the word AUTO remain but they will not be recorded. They remain so that you are aware that this feature is on. When using the Auto Date feature, be aware that the time is only recorded when you first turn on the camcorder and begin a recording session. It does not record each time you press the record button. There are a number of time and date display and recording options. Since these vary by model number, please refer to your owner’s manual for more details.