Regex for date time

var re = /^(\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2})(\.(\d+))?((Z)|(([\+\-])(\d{2}):(\d{2})))$/;

var d = "2016-10-08T18:50:00.12345678-04:00".match(re);

d

(10) ["2016-10-08T18:50:00.12345678-04:00", "2016-10-08T18:50:00", ".12345678", "12345678", "-04:00", undefined, "-04:00", "-", "04", "00", index: 0, input: "2016-10-08T18:50:00.12345678-04:00", groups: undefined]

1. 0: "2016-10-08T18:50:00.12345678-04:00"
2. 1: "2016-10-08T18:50:00"
3. 2: ".12345678"
4. 3: "12345678"
5. 4: "-04:00"
6. 5: undefined
7. 6: "-04:00"
8. 7: "-"
9. 8: "04"
10. 9: "00"
11. groups: undefined
12. index: 0
13. input: "2016-10-08T18:50:00.12345678-04:00"
14. length: 10
15. __proto__: Array(0)