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Is there such command for changing the System clock' date and time?

For example:

The current date and time is January 1, 1970 23:30:59:980 where 59 and 980 refers to the seconds and millisecods respectively

And I want to change it to January 2, 1971 24:31:59:990

Is there a command for this?

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2 Answers 2

up vote 6 down vote accepted

To set time in Ubuntu from terminal, you can use the following command:

sudo date new_date_time_string

where new_date_time_string has to follow the format MMDDhhmmyyyy.ss which is described below:

  • MM is a two digit month, between 01 to 12
  • DD is a two digit day, between 01 and 31, with the regular rules for days according to month and year applying
  • hh is two digit hour, using the 24-hour period so it is between 00 and 23
  • mm is two digit minute, between 00 and 59
  • yyyy is the year; it can be two digit or four digit
  • ss is two digit seconds. Notice the period . before the ss.

Source: Manage Time in Ubuntu Through Command Line.

So, in your particular case, you can use:

sudo date 010224311971.59

Or, you can use:

sudo date --set="1971-01-02 24:31:59.990"  && date --rfc-3339=ns

which is exactly what you asked.

Source: http://serverfault.com/a/338395/181186.

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what is the actual format of the string date? –  Abel Melquiades Callejo Sep 8 '13 at 7:18
    
does that mean the accuracy can only be limited to seconds? –  Abel Melquiades Callejo Sep 8 '13 at 7:22
    
@AbelMelquiadesCallejo See my new edits. –  Radu Rădeanu Sep 8 '13 at 7:34

You can use date command to change time and you need sudo permission to do it, an example to set date as 27 June 2014 and time as 1:17 am is :-

sudo date --set "27 Jun 2014 1:17:00"
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