Same way you select color in Adobe Photoshop.

You can allow alpha transparency selection.

Show pallete only. If you'd like, spectrum can show the palettes you specify, and nothing else.

The datepicker is tied to a standard form input field. Click on the input to open an interactive calendar in a small overlay. If a date is chosen, feedback is shown as the input's value.

The datepicker is tied to a standard form input field. Click on the input to open an interactive calendar in a small overlay. If a date is chosen, feedback is shown as the input's value.