Javascript Cron Expression from Certain Date with Frequency

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I am trying to write a cron expression starting from a Certain Date and make it with certain frequency: run weekly, monthly, or annually?

Reading through cron expression, not sure how it can be expressed from Javascript code .

https://docs.oracle.com/cd/E12058_01/doc/doc.1014/e12030/cron_expressions.htm

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Currently using Typescript in Angular 10,

20 thoughts on “Javascript Cron Expression from Certain Date with Frequency”

  1. Here is Typescript code prepared:

      createweeklyExpression(startDate: Date): string {
    const minute = startDate.getMinutes();
    const hour = startDate.getHours();  
    const weekday = startDate.getDay();

    const finalValue = `${minute} ${hour} * * ${weekday}`;
    return finalValue;
  }

  createMonthlyExpression(startDate: Date): string {
    const minute = startDate.getMinutes();
    const hour = startDate.getHours();
    const dayOfMonth = startDate.getDate();

    const finalValue = `${minute} ${hour} ${dayOfMonth} * *`;
    return finalValue;
  }

  createAnnualExpression(startDate: Date): string {
    const minute = startDate.getMinutes();
    const hour = startDate.getHours();
    const dayOfMonth = startDate.getDate();
    const month = startDate.getMonth();

    const finalValue = `${minute} ${hour} ${dayOfMonth} ${month} *`;
    return finalValue;
  }
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