docs: create doc/guides/howto-incorrect-time

2020-03-09 19:25:29 +00:00 · 2020-03-09 19:25:29 +00:00 · 2b3afb9330
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+---
+title: How to solve the most common cause of incorrect time in dual boot with windows systems
+description: 
+published: true
+date: 2020-03-09T19:25:27.676Z
+tags: documentation, howto
+---
+
+# How to solve the most common cause of incorrect time in dual boot with windows systems
+
+If you have an incorrect time issue in Linux on a dual boot with windows system,
+
+### Check your Linux system:
+```
+$ timedatectl
+                      Local time: Tue 2018-08-21 13:11:23 CDT
+                  Universal time: Tue 2018-08-21 18:11:23 UTC
+                        RTC time: Tue 2018-08-21 18:11:23
+                       Time zone: US/Central (CDT, -0500)
+       System clock synchronized: no
+systemd-timesyncd.service active: yes
+                 RTC in local TZ: no
+```
+
+Look at the last line. If it is: `RTC in local TZ: yes` you are set correctly, and the problem must be elsewhere.
+But most likely you will see local TZ is set to no.
+
+### To fix it run command:
+
+```
+$ sudo timedatectl set-local-rtc 1 --adjust-system-clock
+```
+
+> You will be asked for root password, and the command will be executed.
+{.is-warning}
+
+
+To verify, type again:
+```
+$ timedatectl
+                      Local time: Tue 2018-08-21 18:15:28 CDT
+                  Universal time: Tue 2018-08-21 23:15:28 UTC
+                        RTC time: Tue 2018-08-21 18:15:28
+                       Time zone: US/Central (CDT, -0500)
+       System clock synchronized: no
+systemd-timesyncd.service active: yes
+                 RTC in local TZ: yes
+
+Warning: The system is configured to read the RTC time in the local time zone.
+         This mode cannot be fully supported. It will create various problems
+         with time zone changes and daylight saving time adjustments. The RTC
+         time is never updated, it relies on external facilities to maintain it.
+         If at all possible, use RTC in UTC by calling
+         'timedatectl set-local-rtc 0'.
+```
+
+This is correct.
+*(The warning can be ignored)*
+
+<br>
+### Definitions:
+RTC = Real Time Clock also called hardware clock or hwclock
+TZ = Time Zone