The relative time format specifies a time by using the current time as a reference and specifying a time offset.
+[[[DD:]HH:]MM:]SS
Two days, three hours and fifty-seven seconds in the future:
Three weeks in the future:
Thirty seconds in the future:
The absolute time format specifies a specific time in the future.
[HH[:MM[:SS]]][_MO[/DD[/YY]]] ie 14:30_06/20)
1 PM, March 1 (this year)