Time reverts 7 hours back after each boot

[lensesSenses]

Hello, I just installed Debian 9 and one thing I noticed is that I can't set the time right.
After adjusting the correct time and click 'Set System Time..' button, it changes but after each boot it will go back 7 hours.
I suspect I messed up when I had to select my timezone during installation which I just clicked next.

I also tried with terminal using

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sudo date --set

but the result only stays temporary.
Can you please guide me through fixing the clock? ty

[Bulkley]

Is the battery any good?

[lensesSenses]

Is the battery any good?

I should've mentioned I'm on a laptop, do you think I should get the CMOS battery inspected?

[sunrat]

Is this a dual boot system including Windows?
Is the hardware clock set to UTC or local time?
What time zone are you in, 7 hours different from UTC?

[lensesSenses]

Is this a dual boot system including Windows?
Is the hardware clock set to UTC or local time?
What time zone are you in, 7 hours different from UTC?

I had single boot Ubuntu and installed debian over that, using whole drive. It did leave a uefi entry
Hardware clock is set to UTC (should I change it to 'LOCAL' ?)
I'm currently in Athens so I guess this is EET?

hwclock returns the time like this, is this normal?

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# hwclock 
2019-01-16 23:46:34.570013-0500

[Bulkley]

Take a look at ntpdate. If you have an Internet connection you'll never set time on a computer.

[sunrat]

UTC is default and Athens is UTC +2. Are you sure you have your timezone set correctly? UTC -5 is the time in New York.
Try

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# dpkg-reconfigure tzdata

There's probably some GUI way to do it depending on your DE.

[Head_on_a_Stick]

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timedatectl set-ntp on

[CwF]

Edit /etc/adjtime, and change "UTC" to "LOCAL" if you want the hardware clock to be kept at local time instead of UTC.

[llivv]

Edit /etc/adjtime, and change "UTC" to "LOCAL" if you want the hardware clock to be kept at local time instead of UTC.

What is the diff between /etc/adjtime LOCAL and dpkg-reconfigure tzdata?
How does /etc/adjtime know what local time to use?
my time is set to my local time using dpkg-reconfigure tzdata and my /etc/adjtime is set to UTC

I also have /etc/timezone with my local time settings

nice find by the way CwF !

NTP daemon will sync the hwclock to the ntp servers time automagically
although it will not change timezone settings

ntpdate is a debain script to sync to debian ntp servers
but must be run manually every once in a while using

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 /usr/sbin/ntpdate-debian
17 Jan 11:39:26 ntpdate[2187]: step time server 204.9.54.119 offset -8.101395 sec

[None1975]

NTP daemon will sync the hwclock to the ntp servers time automagically

This is not necessary. You can use systemd utilities. For example, systemd-timesyncd is a daemon that has been added for synchronizing the system clock across the network. It implements an SNTP client. In contrast to NTP implementations such as chrony or the NTP reference server this only implements a client side, and does not bother with the full NTP complexity, focusing only on querying time from one remote server and synchronizing the local clock to it. Unless you intend to serve NTP to networked clients or want to connect to local hardware clocks this simple NTP client should be more than appropriate for most installations.

[Segfault]

Your Debian is hinting it is time to move to Jamaica.

[llivv]

don't worry... / be happy....

making two (binary compatiable) moon bases, moon unit alpha and moon unit zappa