How do I set the digital time on a Casio G-Shock AWG-101

try the link below
http://support.casio.com/en/manual/manuallist.php?cid=009

You can download manual from Casio's web page. I give you couple links.

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You have to set the year, the month and the date. Then you set the time zone. After that you can set the local time. You may also have to set the Daylight Savings Time.
The watch has a built in calendar that may run from let's say January first 2000 to the year 2070 (just a guess). If you set the calendar correctly you do not have to adjust the date when a month has 30 days, or when it is a leap year.

I had a casio and the method was; press the mode button until the display says "HS", then press the 2 or 4 o'clock buttons to adjust the hands to match the digital time; then press mode button until normal operation is achieved.

My watch was a different model to yours, so if this does not work, then you can get
instructions from the Casio web site.

Go to the casio web site "casio.com".

Select "support" and the "manuals",
watches;

Accept terms

Select "watch manual archive"

Read the number of the back of your watch and enter it into the search box

Click on my profile (escapement), then click on Tips and Tricks. There you will find links to all watch manuals. Rate me, please .

The watch will set itself at specific time set times, this is likely to be at 0200 0400 and 0600.
You will however be required to set the time zone, the switch is likely to be on the back.
INFO:
Atomic Time Synchronisation:
How does it work.
SHORT VERSION:
Radio set clocks and watches receive a 60-kilohertz, radio signal from the NIST the official timekeeper for the US and is located in Boulder, Colorado. Ft. Collins. they use atomic clocks and transmits this official time via high frequency short-wave and low frequency AM radio signals, satellite transmission, Internet, and via telephone.

REFERANCE LINKS:
OFFICAL TIME:
http://www.time.gov/timezone.cgi?Eastern/d/-5/java
PHOTO OF ANTANA TRANSMITTERS:
http://tf.nist.gov/stations/wwvb.htm
R/
David
http://antiqueclock.clockstop.com/

It may be that you watch is set to daylight saving time (DST). If you don't have a manual telling you how to remove this, you can get instructions from the Casio web site.

Go to the casio web site "casio.com".

Select "support" and the "manuals", watches;

Accept terms

Select "watch manual archive"

Read the number of the back of your watch and enter it into the search box

Click on "search" and the download your instructions.

Did you try to find solution here?:

http://world.casio.com/wat/download/en/manual/

Rate, please.

Did you go to Casio and download the manual? I just did after my battery change and I hoping it updates tonight at 2,3, or 5am with my watch in the window.

You most likely don't have the Daylight Savings Time (DST) set to AUTO mode. Just hold the ADJUST button until the time starts blinking. Then hit MODE and DST will show on the top. Hit RECEIVE as needed until you see AUTO in the bottom. Then just hit ADJUST 2 more times and you're set.

These instructions are actually for my Casio G-Shock MTG-900 but I imagine they're very similar for most G-Shock atomic watches.