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fundamentals/clock.md

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+# Basics
+
+Show system time:
+
+> date
+
+Show hardware time:
+
+> sudo hwclock -r
+
+Change system time to match hardware time:
+
+> sudo hwclock --hctosys
+
+Change hardware time to match system time:
+
+> sudo hwclock --systohc
+
+Manually set the hardware time to a specified date:
+
+> sudo hwclock --set --date="8/25/19 13:30:00"
+
+# 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:
+
+> sudo apt-get install -y ntp
+
+The shell command for this is `ntpq`.  Monitor the service providers using:
+
+> ntpq -p
+