Time/date not shown properly on some forums/skins

[Valter]

I'm using standard vbdate function to build time, then variable in template to display it.

Example:
$cyb_time = vbdate($vbulletin->options['cyb_timeformat'], TIMENOW);

'cyb_timeformat' is set to "H:i" and $cyb_time displays "22:15" in template.

But for some users it displays "H:i" on output page. Some of them are able to fix this by putting "%" just before parameter. For example "%H:%i". Is this problem with some custom styles or...?

Thanks in advance for any tips.