68 lines
1023 B
Markdown
68 lines
1023 B
Markdown
---
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title: "clock"
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tags: [ "Documentation", "Basics" ]
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---
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Show system time:
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```bash
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date
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```
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Show hardware time:
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```bash
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sudo hwclock -r
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```
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Change system time to match hardware time:
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```bash
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sudo hwclock --hctosys
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```
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Change hardware time to match system time:
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```bash
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sudo hwclock --systohc
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```
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Manually set the hardware time to a specified date:
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```bash
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sudo hwclock --set --date="8/25/19 13:30:00"
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```
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## Normal Date
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```bash
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date +%d/%m/%y
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```
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# Unix Time
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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.
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Track the time in Unix-time:
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```bash
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date +%s
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```
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# Network Time Providers
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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.
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Install ntp with:
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```bash
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sudo apt-get install -y ntp
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```
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The shell command for this is `ntpq`. Monitor the service providers using:
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```bash
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ntpq -p
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```
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