Oarcle Lite cannot subtract negative numbers from date

Hello
we have a very strange problem. We have a query that need to convert times between different timezones. So, we have
In Oracle lite, the query
select sysdate - (-60/1440) nd from dual returns sysdate + 2 - 60/1440.
Whenever a negative fraction is subtracted from date, it always adds two days and then adds the fraction. Looks like negative of a negative fraction is not handled correctly in oracle lite.
Did anyone encounter this problem? We have the system in production and wondering if anyone found a solution.
Thanks

HI sd,
I suspect there's a simpler way, but this works, as seen in the example. Start and finish times are both incremented by one day as the data and formula are filled down the columns to show the effect of crossing the weekend days. Formula (as it appears in row 7) is shown above the table. The Row 2 version is copied below. Cels in column D are formatted as shown in the Inspector.
D2: =NETWORKDAYS(B2,C2,)+DURATION(,,24*(DUR2DAYS(C2-B2)-INT(DUR2DAYS(C2-B2))),,,)
Regards,
Barry

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