Source state '*' = current synced, '+' = combined, '-' = not combined, Source mode '^' = server, '=' = peer, '#' = local clock.
#Linux setdate windows#
An instance needs access to the internet for the externalįor Windows instances, see Set the time for a Windows instance. More information about NTP and public time sources, see. Alternatively, you can use external NTP sources. Use the following procedures to configure the Amazon Time Sync Service on your instance
The latest versions ofĪmazon Linux 2 and Amazon Linux AMIs synchronize with the Amazon Time Sync Service by default. Your security group rules or your network ACL rules to allow access. Your instance does not require access to the internet, and you do not have to configure The IPv6 address is only accessible on Instances built on the Nitro System. IPv4 address or the fd00:ec2::123 IPv6 address for any instance running in a The Amazon Time Sync Service is available through NTP at the 169.254.169.123 The Amazon Time Sync Service automatically smooths any leap seconds that are added to Of the Coordinated Universal Time (UTC) global standard through Network Time Protocol (NTP). This service uses a fleet of satellite-connectedĪnd atomic reference clocks in each AWS Region to deliver accurate current time readings If your instance'sĭate and time are not set correctly, the date in the signature may not match the date of theĪmazon provides the Amazon Time Sync Service, which is accessible from all EC2 instances,Īnd is also used by other AWS services. Requests from your instance, these tools sign requests on your behalf. If you use the AWS CLI or an AWS SDK to make Most system logs include a time stamp that you can use to determine when problems occurredĪnd in what order the events took place. $ cat script.A consistent and accurate time reference is crucial for many server tasks and processes. You can get an easy-to-use date variable for logging to files like this. These modifiers are especially useful in scripts. The following optional flags may follow ‘%’: %Z alphabetic time zone abbreviation (e.g., EDT)īy default, date pads numeric fields with zeroes. %:::z numeric time zone with : to necessary precision (e.g., -04, +05:30) %X locale’s time representation (e.g., 23:13:48) %x locale’s date representation (e.g., 12/31/99) %W week number of year, with Monday as first day of week (00.53)
#Linux setdate iso#
%V ISO week number, with Monday as first day of week (01.53) %U week number of year, with Sunday as first day of week (00.53) %p locale’s equivalent of either AM or PM blank if not known %G year of ISO week number (see %V) normally useful only with %V %g last two digits of year of ISO week number (see %G) %e day of month, space padded same as %_d %C century like %Y, except omit last two digits (e.g., 20)
#Linux setdate full#
%B locale’s full month name (e.g., January) %b locale’s abbreviated month name (e.g., Jan) %A locale’s full weekday name (e.g., Sunday)
%a locale’s abbreviated weekday name (e.g., Sun) You can replace them in any of the examples above to get different outputs. With the -d parameter you can also let it jump back & forth and show you a different date. It’ll show the current time or date when you execute the command. The date command also allows you pretty easy manipulation of the “current date”. Or a more complete example which follows the Apache log format of displaying dates (ie: ).
Or just to display the current time: $ date +"%T" Some examples below.įor instance, a simple YYYY-MM-DD representation: $ date +"%Y-%m-%d" If also allows you to modify its output with special FORMAT options. The Linux date command by default has a pretty readable output. This is going to be a very simple guide, but one I often find myself needing ( because who can remember these formats, right?).
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