Consistent time on schedule for talks.

Instead of relying into the [Date.toLocaleDateString][1] which is **very**
browser dependent, get Hour and Minute information directly using
Date.getHours() and Date.getMinutes() methods.

PS: I haven't tested this. :stuck_out_tongue: 

[1]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toLocaleDateString