Find nearest time from list of time to TimeNow

Question

I have 5 textbox with time :

Textbox1 = 05:04
Textbox2 = 06:26
Textbox3 = 11:42
Textbox4 = 14:38
Textbox5 = 16:57
Textbox6 = 16:57
Textbox6 = 18:15

and need to check the nearest textbox value to time now