error check

i have a system that allows users to clock in and out (ie before work and after work). i can error check for the time whether it is valid (ie is the clock out time greater than the clock in time). however if i wnat the users to clock out multiple times (ie before work, after work, before lunch, after they lunch), then i assume i need to use a for loop to do the checking right?
anyone got any guide for me??

how are you storing the last clocked time for comparison?

all clock time is stored under id txtClockTime

all clock time is stored under id txtClockTime

you will need to be specific, format, retreval etc

do u mean this?

<INPUT type="text" name=txtClockTime maxlength=5 size=5 value="<%=formatdatetime(v_HistTime,4)%>