lk/basics/clock.md

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---
title: "clock"
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tags: [ "Documentation", "Basics" ]
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---
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Show system time:
```bash
date
```
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Show hardware time:
```bash
sudo hwclock -r
```
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Change system time to match hardware time:
```bash
sudo hwclock --hctosys
```
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Change hardware time to match system time:
```bash
sudo hwclock --systohc
```
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Manually set the hardware time to a specified date:
```bash
sudo hwclock --set --date="8/25/19 13:30:00"
```
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## Normal Date
```bash
date +%d/%m/%y
```
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# Unix Time
Computers started counting time on January 1st, 1970, and added one second-per-second. If your clock shows you're in the 70's, it's reset to the start.
Track the time in Unix-time:
```bash
date +%s
```
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# Network Time Providers
Servers which take their time from an observatory we call Stratum 1 servers. Servers which takes their time from Stratum n servers are Stratum n+1 servers.
Install ntp with:
```bash
sudo apt-get install -y ntp
```
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The shell command for this is `ntpq`. Monitor the service providers using:
```bash
ntpq -p
```
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