excel - Google spreadsheet - Formula does not show negative time -

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i have google spreadsheet write down working time. example there following records

g9 | 05:05

h9 | 06:30

now want calculate if there time left or not. first try:

=if(g9>0;g9-h9;0)

second try:

=if(g9>0;if(g9<h9;g9-h9;h9-g9);0)

unfortunately both ends time 22:35. because calculation below 0 let system think should start 24:00.

how can display value -1:25 or vice-versa positive times (1:05 e.g.) dynamically formula?

i have tried change format of field, doesn't work since display times negative ones, when positive.

edit:

as information if has troubles work text values. @words mentioned have convert value. need function if want work arrays:

=sum(arrayformula(value(i2:i32)))

one can convert time string text, , prepend "-" when needed: 

=if(g9>=h9, text(g9-h9, "h:mm"), "-" & text(h9-g9, "h:mm"))

the result string, if it's needed in later computations 1 can still recover original value value.


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