Is there a way I can change the time intervals from 5 minutes to 1 minute when selecting the Date and Time control on a list? I saw Mary's solution of this here, however since we're creating a form that will have over 100 Date and Time columns it would be too time consuming to do it this way. Any suggestions?
jQuery simple Date Time picker might work for you.
Please refer to the below site
To set the interval use "minute_interval" option:
'minute_interval' : 15
Hope this helps