"The competent programmer is fully aware of the strictly limited size of his own skull; therefore he approaches the programming task in full humility, and among other things he avoids clever tricks like the plague." – Edsger W. Dijkstra
Edge date picker of ‘Ext.field.Date‘ is generally used on small form-factor devices. However, bug happens when you use multiple date fields. It was described by RC on stack-overflow and it took a bit more time for me to fix it.