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I use my Pi as part of a home automation system, logging and carrying out events according to time. It is connected to a working internet connection, but let's say the power temporarily goes out and the Pi boots up faster than the router - is there a command line or Bash to run for example 5 mins later for the Pi (Raspbian Wheezy) to update the date from the time server again?

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Run ntpd in terminal - it's not too heavy a load and ensures your Pi's time is bang on all the time, RTC is good if you have no internet but ntpd is easy if you do...

  • Thanks! "@reboot sudo ntp-wait" in cronfile works well for me. ntpd in terminal will also work, but not keep on trying if it fails. – Renier Delport Apr 7 '16 at 10:25

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