Time / Date Format - 24 Hour Clock

Time / Date Format - 24 Hour Clock

Email arrival time is displayed in this format 06:32 AM and 06:32 PM. It's a kind of mismash of a 24 hour and 12 hour display format. Is there a way to get it to show in 24 Hours, eg 06:32 and 18:32.  The preceding 0 can be confusing at quick glance, espically for PM.