We have a microsite ready in html and we have a schedule of event in this site. We would like to add on a add to calendar function ie. once user click on the event calendar image, it allows them to save the date/time/event details in their phone (Android or IOS) or desktop calendar. We are looking for native coding without any 3rd party code or sign up of 3rd party account in order to use this.
This is quite an urgent task, bid if u have confidence to deliver in few hours time once confirmed and have done this before.