Werk #2141: Fix computation of explicit time ranges with time of day

When you entered an explicit time range (e.g. in the options for the graph time range) and selected Explicit time... then 24 hours would be added to the end time. This has been fixed. Note: the adding of one day is still being done when selecting Explicit date..., so that if you select the same start and end date the span is exactly 24 hours.

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