# set_system_clock_from_google.sh

Sets system time based on what is reported by google.com.  Useful for cases where it is not possible to use the standard `ntpdate` command.  For eample, if a Linux machine is on a network which is only able to reach the internet through an HTTP proxy.

Inspired by ryenus' answer @ https://superuser.com/a/807326/72342

## Installation

```bash
# Download latest set_system_clock_from_google.sh script.
curl -sS --remote-name-all $( \
    curl -sS https://api.github.com/gists/60c8a4e22431c4271200cab68186deb7 \
        | jq -r '.files[].raw_url' \
        | grep -v '\/\._' \
)

# Set permissions and move to local sbin.
chmod a+x set_system_clock_from_google.sh
sudo chown root:root set_system_clock_from_google.sh
sudo mv set_system_clock_from_google.sh /usr/local/sbin/
```

##  Cronjob Scheduling

Here is a command to install a cronjob which syncs the system clock at the top of every hour:

```bash
(sudo crontab -l 2>/dev/null; echo '1 * * * * /usr/local/sbin/set_system_clock_from_google.sh') \
    | sudo crontab -
```

### Verify installation

List all root cronjobs and verify the job has been added:

```bash
sudo crontab -l
```

### Example output

```
1 * * * * /usr/local/sbin/set_system_clock_from_google.sh
```

## Run or test it manually

Verbose output is available when the `-v` flag is passed.

```bash
/usr/local/sbin/set_system_clock_from_google.sh -v
```