This is just plain JavaScript, TypeScript is not needed.
yourDate = new Date(yourDate.getTime() + (1000 * 60 * 60 * 24));
1000 milliseconds per second * 60 seconds per minute * 60 minutes per hour * 24 hours.
In addition, you can increase the date:
yourDate.setDate(yourDate.getDate() + 1);
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