Skip to main content

more on precise date on ocaml

Dealing with "Precise" Dates

I already posted an article on (begining) playing with Dates on OCaml.

Preparing the Toplevel

As usual, we have to load and use several modules:

 #use "topfind";; #require "calendar";; 

Creating a Second

To create a second, the top reachable precision:

 CalendarLib.Time.Second.from_int 5;; 

Creating a Precise Date

To create a precise date, let's use the "make" function:

 CalendarLib.Fcalendar.Precise.make 2011 08 12 05 32 (float_of_int (CalendarLib.Time.Second.from_int 5));; CalendarLib.Fcalendar.Precise.make 2011 08 12 05 32 5.;; 

Create a Precise Period

When wanting to add 2 days to a date, we must use "The Date + 2 days Period". To create that "Period":

 CalendarLib.Fcalendar.Precise.Period.make 2011 08 12 05 32 (float_of_int (CalendarLib.Time.Second.from_int 5));; CalendarLib.Fcalendar.Precise.Period.make 2011 08 12 05 32 5.;; 

Make an operation (add)

Let's create a Date, and calculate the "two days later" Date:

 let d2 = CalendarLib.Fcalendar.Precise.add (CalendarLib.Fcalendar.Precise.make 2011 08 12 05 32 (float_of_int (CalendarLib.Time.Second.from_int 5))) (CalendarLib.Fcalendar.Precise.Period.make 0 0 2 0 0 (float_of_int (CalendarLib.Time.Second.from_int 0))) ;; let d2 = CalendarLib.Fcalendar.Precise.add (CalendarLib.Fcalendar.Precise.make 2011 08 12 05 32 5.) (CalendarLib.Fcalendar.Precise.Period.make 0 0 2 0 0 0.) ;; 
Then display it:
 CalendarLib.Printer.Precise_Fcalendar.to_string d2;; 

If the Date was from a string

I mostly intend to take the Date from an external source: A "date" field from a SQLite3 database, which is formatted "2011-08-16 16:00:01". To use it:

 let initiale = CalendarLib.Printer.Precise_Fcalendar.from_fstring "%F %T" "2011-08-16 16:00:01";; 
Then to add 2 days to it:
 let initiale_2 = CalendarLib.Fcalendar.Precise.add initiale (CalendarLib.Fcalendar.Precise.Period.make 0 0 2 0 0 (float_of_int (CalendarLib.Time.Second.from_int 0))) ;; 
Finally print it:
 CalendarLib.Printer.Precise_Fcalendar.to_string initiale_2;; 

Comments

Popular posts from this blog

npm run build base-href

Using NPM to specify base-href When building an Angular application, people usually use "ng" and pass arguments to that invocation. Typically, when wanting to hard code "base-href" in "index.html", one will issue: ng build --base-href='https://ngx.rktmb.org/foo' I used to build my angular apps through Bamboo or Jenkins and they have a "npm" plugin. I got the habit to build the application with "npm run build" before deploying it. But the development team once asked me to set the "--base-href='https://ngx.rktmb.org/foo'" parameter. npm run build --base-href='https://ngx.rktmb.org/foo did not set the base href in indext.html After looking for a while, I found https://github.com/angular/angular-cli/issues/13560 where it says: You need to use −− to pass arguments to npm scripts. This did the job! The command to issue is then: npm run build -- --base-href='https://ngx.rktmb.org/foo&

dockerfile multiline to file

Outputing a multiline string from Dockerfile I motsly use a Dockerfile by sourcing from a base ditribution: CentOS or Debian. But I also have a local mirror and would like to use it for packages installation. Espacially on CentOS it is about many lines to write to the /etc/yum.repos.d/CentOS-Base.repo file. Easiest way: one RUN per line The first method that comes in mind is to issue one RUN per line to write. Here you are: RUN echo "[base] " > /etc/yum.repos.d/CentOS-Base.repo RUN echo "name=CentOS-$releasever - Base " >> /etc/yum.repos.d/CentOS-Base.repo RUN echo "baseurl=ftp://packages-infra.mg.rktmb.org/pub/centos/7/base-reposync-7 " >> /etc/yum.repos.d/CentOS-Base.repo RUN echo "gpgcheck=0 &quo

Jira workflow for new projects

Associated workflow creation I'm a Jira Cloud user and begining from some version 6, I noticed that when I create a project, it automatically creates a Workflow and Issue Scheme that is prepended by the project key and which is a copy of the default scheme. I always had to make a cleanup after creating a project. Default workflow for new projects I also miss a feature that would allow me to make a custom workflow (and globally custom project setting) the default for new projects I create. Solution: Create with shared configuration While searching, I noticed that with Jira Cloud which is version 7.1.0 at the time I write, there is a link at the bottom of the "Create project" wizard: "Create with shared configuration" will allow me to select the project I want the new one to share configuration with. The new created project will use the same configuration as the project I select There will be no creation of Workflow and Issue Scheme that