If the model number you listed this question under is correct, you can the time by following these steps:
1. Press CLOCK
2. Enter time by pressing the numbers on the keypad.
3. Select AM or PM by pressing the AM/PM button.
4. Then, press START or CLOCK.
These procedures are listed on page 25 of your owner's manual. If you no longer have an owner's manual you can obtain a copy at managemylife.com. Just enter your model number under the "Manuals" tab and your owner's and installation manuals are listed in .pdf format that can be downloaded or printed for FREE.
For your convenience, here is a direct link:
http://www.managemylife.com/mmh/owner_manuals/5792/GE-Microwave-Hood-Combo-L0307022?brand_name_search=JVM1640SJ
If you have any further questions, please post back and let me know. I hope this helps you.
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