Timers 49646 don't have instructions how to set

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Make + Model + the word "Manual" or "instructions"

or contact the manufacturer.

Question posted under Intermatic ST01C, but Timer is not 100% identified since ST01C is battery powered, and should not lose programming or stop working with ordinary power outage.
Most digital timers have a battery or capacitor back-up for power outage.
Add a comment with description of timer buttons, or open link below to see most brands of in-wall timer.

Open following link for to identify Intermatic ST01C and Ei600 and download instructions:
http://waterheatertimer.org/ST01C-program.html#battery
ST01C timer has a battery backup. Power outage will NOT cause battery-powered display to fail, but power outage and power surge can cause any electronic timer to fail.
So either the battery went dead, or power surge ruined timer, or you don't have ST01C timer.

If ST01c display is not showing, then replace battery and then reprogram current time -or- manually re-set timer and then reprogram timer.

Woods 49646 timer appears to be 24-hour analog timer.

Open following link to identify timer:
http://www.menards.com/main/electrical/safety-security/timers/indoor-timer-2-outlets/p-1462729-c-6471.htm

Open following link for instructions how to set and use analog timers:
http://waterheatertimer.org/How-to-set-timers.html

Open following link if information above does not match your timer, and you want to identify different timer:
http://waterheatertimer.org/Woods-timers-and-manuals.html#59200

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1) Sept 2011.
If you have a T1030D timer instruction manual, then that would be helpful for many people.
Scan manual into .jpg format (file format) and then post images on Flickr.
Add a comment with link to those images so expert can access the information.

2) Currently the only instruction manual is the following, where you can also send information saying what your instruction manual says:
http://waterheatertimer.org/pdf/Instructions-for-setting-Gardena-T1030D.pdf
http://waterheatertimer.org/How-to-program-Gardena-C1060.html#manuals

3) That being said:
Let me add some guessing, and then you can add a comment with what you observe.
Between us we might be able to work out a solution.

4) I don't think you can set specific dates on either T1030 or T1030D
It appears the T1030D is a weekly timer, just like T1030.
The word 'date' does not appear in T1030 manual except 'date of purchase.'
http://waterheatertimer.org/pdf/Gardena-1030-MANUAL.pdf

5) T1030D: each day of the 7-day week is broken into hour 1 through 24.
Each day can have between 1 to 3 settings. I think this is frequency.
You can set the watering run-time from 1 to 120 minutes for each set time.

Brinks 42-1020 is analog timer with 48 segments (pins) located around edge of dial.
Each segment (pin) represents 15 minutes in 24 hour day.
Segments on this timer push down and outward.
Open following links for instruction illustrations:
http://waterheatertimer.org/pdf/Brinks-42-1020-manual.pdf
http://waterheatertimer.org/How-to-set-timers.html

Question posted under Intermatic timer:
Open following link to identify timer and download possible manual:
http://waterheatertimer.org/Intermatic-timers-and-manuals.html

IF Intermatic timer stopped working because battery failed, then all that's needed is to reprogram current time, because the original timer programs you set are stored inside timer forever until timer is manually reset using reset button.

If you have Intermatic ST01C timer, then open following page for ez instructions:
http://waterheatertimer.org/ST01C-program.html

If you need help programming specific timer, then get as far along in manual as possible, and then add a comment.

If you have different brand timer, than each brand has link that shows on Intermatic page.

Open following link to identify Paragon 4004 240Volt timer, download manual, see typical wiring, and see instruction illustration.
ttp://waterheatertimer.org/Paragon-timers-and-manuals.html#4000

you can find that info here http://waterheatertimer.org/How-to-set-timers.html

You can download your instructions here:

R673CT Digital Water Timer Installation Manual

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49646 sounds like a Woods timer number, but there is not such a number.

1) Look at following links to see if you can identify your timer
http://waterheatertimer.org/Woods-timers-and-manuals.html
http://waterheatertimer.org/UPM-timers-and-manuals.html
http://waterheatertimer.org/GE-timers-and-manuals.html
http://waterheatertimer.org/Sitemap.html

2) For free help, add a comment describing timer in great detail
I have extensive files on timers

3) Take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.