This a test given to Salim EL Haddad by One of the two founders of the start-up Nimble ways Mr.Antoine ORY-LAMBALLE

         =>create a web site using angular4
         =>Specification:->Two date fields and a button to submit.
                         -> When both the two dates are valid.It should display the number
                            of days between the two dates.
                         -> Styling the web site (User experience)

the project consists of creating two input date fields,a start date and an end date. The start date should be inferior to the end date.So a function called "displayMessagesWhenTwoDatesValid" is used to make sure it's the case.it's also required to check if both dates are valid, otherwaise a message is diplayed in the page explaining the reason of the error.If the dates are both valid,then a message is displayed specifying the number of dates between the the two dates.

Project structure: the project is created using angular-cli .It contains one component which is the app-comonent and one service which check for validation of the two dates. Modules used:

• MomentModule : It is a module containing a variety of pipes . In the context of this project,it's used to compute the difference of days between the two dates entered by the user.
• RoundPipe: used to round a float number to its closest integer.
• Angular Material 2 : used for designing the user experience.In the context of this project ,BrowserAnimationsModule,MdButtonModule,MdDatepickerModule,MdInputModule and MdNativeDateModule.Please refer to the documentation to see their utilities in details:"https://material.angular.io/components"