This chapter makes you familiar with all the most wanted concepts of date and time.
Ruby current date timestamp.
Datetime ruby 2 6 1.
The time options hour min sec reset cascadingly so if only the hour is passed then minute and sec is set to 0 if the hour and minute is passed then sec is set to 0.
Year month day hour min sec offset.
Date and datetime classes are both from date library.
However if you need to deal with dates and times in a historical context you ll want to use datetime to avoid making the same mistakes as unesco.
Current time 2019 09 05 04 08 27 0000 2019 9 5 4 248 4 8 27 864801 utc.
Date time parsing.
Date today current date date new returns a negative date date arithmetic is similar to the time class the difference is that you add days instead of seconds.
1600740895 seconds since jan 01 1970 utc this epoch translates to.
Quite often when there is a heavy load logstash queue becomes huge.
The julian day number is in passed day since noon.
But underneath time class stores integer numbers which presents the seconds intervals since the epoch.
Returns a new datetime where one or more of the elements have been changed according to the options parameter.
09 22 2020 2 14am utc 2020 09 22t02 14 55 00 00 in iso 8601 tue 22 sep 2020 02 14 55 0000 in rfc 822 1036 1123 2822 tuesday 22 sep 20 02 14 55 utc in rfc 2822 2020 09 22t02 14 55 00 00 in rfc 3339.
Remember that dates generated by 1 day ago and date current beginning of month will consider the time zone so feel free to use them.
Both datetime and time classes can be used to handle year month day hour min sec attributes.
The time class represents dates and times in ruby.
The calendar date is specific day of a calendar.
A lot of events have syslog timestamp which happened few minutes ago.
That timestamp field gets converted to timestamp by logstash.
Date today 1 adds one day a date doesn t know anything about hours seconds or minutes so only use this class if you don t need these.
Parsing dates sent by users.
Ruby has the methods time parse and date parse but they ignore this information.
Getting current date and time.
The current unix timestamp.
We would like to have datetime now in timestamp field.
Something like timestamp is the date when document appeared in elasticsearch.
Almost certainly you ll want to use time since your app is probably dealing with current dates and times.
This class may be unable on your system to represent dates before 1970 or after 2038.
The options parameter takes a hash with any of these keys.
The ordinal date is a specific day of a calendar year.
The week date is a date which represent week in the calendar.
It is a thin layer over the system date and time functionality provided by the operating system.
When parsing dates you must also consider time zones.
