Character Description h Hour in 12-hour format, with leading zero (two digits). g Hour in 12-hour format (no leading zero). H Hour in 24-hour format, with leading zero (two digits). G Hour in 24-hour format (no leading zero). a am/pm (lowercase). A AM/PM (uppercase). O(uppercase o) String representation of the difference in hours between local time and GMT/UTC (for w3mentor, +1000, ï¿½0500).