Well, the format of your number has no numerical relationship to the time.
This is the format that it appears that you want:
hour*10000 + minute*100 + second
To get that format you must implement that algorithm. There might be a simpler way but this will work:
Note that the Format Date/Time String function will use the current time if nothing is wired to the timestamp input.
To convert a number in that format to a string you must implement the reverse process of splitting the number into separate values for hours, minutes, and seconds. Then each must be converted to a string. The individual strings can be concatenated to form a single string.
Lynn