They are not date/time values, because Access cannot display that many
hours/minutes/whatever, so I assume they are text strings. You cannot add
text strings up.
It would appear that you are trying to use a Date/Time variable or Field as
something other than what it is: a representation of a point in time... date
and time. If you want to deal with hours and minutes as numeric entities,
you should keep them in a numeric field, probably separately, though you
could convert the minutes to a fraction of hours.
Larry Linson
Microsoft Access MVP
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