In the iOS email client, when an email contains a date, time or location, the text becomes a hyperlink and it is possible to create an appointment or look at a map simply by
This is called temporal expression identification and parsing. Here are some Google searches to get you started:
https://www.google.com/#hl=en&safe=off&sclient=psy-ab&q=timebank+timeml+timex
https://www.google.com/#hl=en&safe=off&sclient=psy-ab&q=temporal+expression+tagger