Mavericks clock AM/PM disappears

I have the exact same problem. It is occurring on both my 13" mid-2011 MacBook Air (the problem never occurred before I upgraded to Mavericks) as well as on my late-2013 iMac that I just bought.

Furthermore, I got irritated enough that I switched off the AM/PM indicator, and now I noticed that my entire clock display disappeared! (hh:mm)

As the OP said, switching to analog clock and then back to digital clock solves the problem temporarily.

I have the same issue too.

I changed the system font to 'Proxima Nova' and after that I have the issue. So it is something to do with the width of a letter.

I guess the "problem" doesn't occur with the default LucidaGrande font.

That's interesting, that it might have to do with a font size issue. However, I haven't made any changes to the default font, so it certainly occurs with LucidaGrande.

same issue...
i didn't change the system font... still face the problem...

I use 24-hour clock on my imac and the entire thing disappears after coming back from sleep mode. (Weekday still appears.)

+1 Same issue.. happens on all the Mavericks installs I've seen. I'd say its a bug that most people don't notice.

I have the same issue too.

+1 same issue. The clock dissappears intermittently but the date is still visible

Another +1

You can add me to the list, exactly the same thing happens on my macbook late 2009 since upgraded to mavericks, is not a big issue but somehow anoying.

Unbelievable! After upgrading my brand new imac to Mavericks, I have the same problem I had with my old one - disappearing time continues ...

Yes, another +1.

I find that if I just open the Date & Time Preferences dialog, the issue gets resolved and I can again see the AM/PM next to the time.

Even though a minor bug, it is somewhat irritating. Maybe they will fix it in one of the updates.

+1 I have this problem as well. Not a huge problem but is annoying that it happends often, I'm just thankful it's not a bug that slows the performance of my high end late 2013 13" MBPwRd hope they get a fix soon.

+1. I am having the same issue.! am/pm simply disappears.!

Has anyone found a solution to this problem?? I am having similar issue and just wondering if there is a solution?

I have found that in Mavericks you must select the correct time format in Language and Region in system preferences first before adjusting your time and date settings i.e.check the "24-hour time" box underneath the "Region:, First Day of Week:, and Calendar:" drop downs. I did this and immediately the time and date settings were responsive and my calendar and reminders etc all used 24 hour clocks as well. Hope that solves for you.