To create a link for Google Calendar events

create-google-event-link.js

/**
 * createGoogleCalendarLink accepts an input object in this form:
 * ```
 * {
 *      title?: "string",
 *      details?: "string",
 *      location?: "string",
 *
 *      start: {
 *          year: string, day: string, month: string,
 *          hour: string, minute: string
 *      },
 *
 *      end: {
 *          year: string, day: string, month: string,
 *          hour: string, minute: string
 *      },
 * }
 * ```
 *
 * Not that `?` is for the optional ones
 *
 * @param {object} input
 */
function createGoogleCalendarLink ( input ) {
    // toolings
    const baseURL =
        "https://www.google.com/calendar/render?action=TEMPLATE?"

    const arguments = [ ]

    const append = ( key, value ) =>
        arguments.push( key + "=" + encodeURIComponent( value ) )

    const encodeDate = ( obj ) =>
        obj.year + obj.month + obj.day + "T" + obj.hour + obj.minute + "00Z"

    // optionals
    if ( input.title )      append( "title", input.title )
    if ( input.details )    append( "details", input.details )
    if ( input.location )   append( "location", input.location )

    // main dates
    append( "dates",
        encodeDate( input.start ) + "/" + encodeDate( input.end ) )

    // and done
    return baseURL + arguments.join( "&" )
}


// example
console.log( createGoogleCalendarLink({
    title: "something to have an event for",
    // details: "stuff, blah blah",
    location: "virgo supercluster",

    start: {
        year: "2017", day: "18", month: "11",
        hour: "20", minute: "18"
    },

    end: {
        year: "2017", day: "19", month: "11",
        hour: "20", minute: "10"
    }
}))

The example outputs:

https://www.google.com/calendar/render?action=TEMPLATE?title=something%20to%20have%20an%20event%20for&location=virgo%20supercluster&dates=20171118T201800Z%2F20171119T201000Z