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How to correctly fake time?


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3















In order to resolve a specific timezone related bug on a software project that I'm working on, I'm trying to replicate a change on the system's clock using timedatectl to check my software behavior.



I'm trying to achieve that by running



timedatectl set-timezone America/New_York
timedatectl set-local-rtc 1
timedatectl set-ntp false
timedatectl set-time "2017-03-12 01:58:50" && hwclock -w


When I do that and run timedatectlright after, I get the expected following time:



Local time: Sun 2017-03-12 01:58:51 EST
Universal time: Sun 2017-03-12 06:58:51 UTC
RTC time: Sun 2017-03-12 01:58:51
Time zone: America/New_York (EST, -0500)
System clock synchronized: no
systemd-timesyncd.service active: no
RTC in local TZ: yes


However, 10 seconds after this, when the minute changes (to xx:59), the local and universal time kind of "reboot" to the current time



Local time: Wed 2019-08-07 21:01:41 EDT
Universal time: Thu 2019-08-08 01:01:41 UTC
RTC time: Sun 2017-03-12 01:58:57
Time zone: America/New_York (EDT, -0400)
System clock synchronized: no
systemd-timesyncd.service active: no
RTC in local TZ: yes


What am I missing here?



My setup is an Vagrant Ubuntu 18 VM (Linux vagrant 4.15.0-51 / vm box "bento/ubuntu-18.04").










share|improve this question









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    3















    In order to resolve a specific timezone related bug on a software project that I'm working on, I'm trying to replicate a change on the system's clock using timedatectl to check my software behavior.



    I'm trying to achieve that by running



    timedatectl set-timezone America/New_York
    timedatectl set-local-rtc 1
    timedatectl set-ntp false
    timedatectl set-time "2017-03-12 01:58:50" && hwclock -w


    When I do that and run timedatectlright after, I get the expected following time:



    Local time: Sun 2017-03-12 01:58:51 EST
    Universal time: Sun 2017-03-12 06:58:51 UTC
    RTC time: Sun 2017-03-12 01:58:51
    Time zone: America/New_York (EST, -0500)
    System clock synchronized: no
    systemd-timesyncd.service active: no
    RTC in local TZ: yes


    However, 10 seconds after this, when the minute changes (to xx:59), the local and universal time kind of "reboot" to the current time



    Local time: Wed 2019-08-07 21:01:41 EDT
    Universal time: Thu 2019-08-08 01:01:41 UTC
    RTC time: Sun 2017-03-12 01:58:57
    Time zone: America/New_York (EDT, -0400)
    System clock synchronized: no
    systemd-timesyncd.service active: no
    RTC in local TZ: yes


    What am I missing here?



    My setup is an Vagrant Ubuntu 18 VM (Linux vagrant 4.15.0-51 / vm box "bento/ubuntu-18.04").










    share|improve this question









    New contributor



    streppel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.
























      3












      3








      3








      In order to resolve a specific timezone related bug on a software project that I'm working on, I'm trying to replicate a change on the system's clock using timedatectl to check my software behavior.



      I'm trying to achieve that by running



      timedatectl set-timezone America/New_York
      timedatectl set-local-rtc 1
      timedatectl set-ntp false
      timedatectl set-time "2017-03-12 01:58:50" && hwclock -w


      When I do that and run timedatectlright after, I get the expected following time:



      Local time: Sun 2017-03-12 01:58:51 EST
      Universal time: Sun 2017-03-12 06:58:51 UTC
      RTC time: Sun 2017-03-12 01:58:51
      Time zone: America/New_York (EST, -0500)
      System clock synchronized: no
      systemd-timesyncd.service active: no
      RTC in local TZ: yes


      However, 10 seconds after this, when the minute changes (to xx:59), the local and universal time kind of "reboot" to the current time



      Local time: Wed 2019-08-07 21:01:41 EDT
      Universal time: Thu 2019-08-08 01:01:41 UTC
      RTC time: Sun 2017-03-12 01:58:57
      Time zone: America/New_York (EDT, -0400)
      System clock synchronized: no
      systemd-timesyncd.service active: no
      RTC in local TZ: yes


      What am I missing here?



      My setup is an Vagrant Ubuntu 18 VM (Linux vagrant 4.15.0-51 / vm box "bento/ubuntu-18.04").










      share|improve this question









      New contributor



      streppel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      In order to resolve a specific timezone related bug on a software project that I'm working on, I'm trying to replicate a change on the system's clock using timedatectl to check my software behavior.



      I'm trying to achieve that by running



      timedatectl set-timezone America/New_York
      timedatectl set-local-rtc 1
      timedatectl set-ntp false
      timedatectl set-time "2017-03-12 01:58:50" && hwclock -w


      When I do that and run timedatectlright after, I get the expected following time:



      Local time: Sun 2017-03-12 01:58:51 EST
      Universal time: Sun 2017-03-12 06:58:51 UTC
      RTC time: Sun 2017-03-12 01:58:51
      Time zone: America/New_York (EST, -0500)
      System clock synchronized: no
      systemd-timesyncd.service active: no
      RTC in local TZ: yes


      However, 10 seconds after this, when the minute changes (to xx:59), the local and universal time kind of "reboot" to the current time



      Local time: Wed 2019-08-07 21:01:41 EDT
      Universal time: Thu 2019-08-08 01:01:41 UTC
      RTC time: Sun 2017-03-12 01:58:57
      Time zone: America/New_York (EDT, -0400)
      System clock synchronized: no
      systemd-timesyncd.service active: no
      RTC in local TZ: yes


      What am I missing here?



      My setup is an Vagrant Ubuntu 18 VM (Linux vagrant 4.15.0-51 / vm box "bento/ubuntu-18.04").







      time timezone






      share|improve this question









      New contributor



      streppel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.










      share|improve this question









      New contributor



      streppel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.








      share|improve this question




      share|improve this question








      edited 42 mins ago







      streppel













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      asked 1 hour ago









      streppelstreppel

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      Check out our Code of Conduct.



























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