Editing EXIF time with 24h and/or AM-PM

When editing capture time there is no way to specify time in 24h or specify AM/PM, so for change time to 22:00:00 I have to set 10:00:00, and then verify if it asumed 10am or 10pm, if it asumed 10am I have to edit the hour individually and raise the value 12 times, and verify again.