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  1. program ideone;
  2. Uses sysutils, dateutils;
  3. function f(hms : string) : string;
  4. begin
  5. f := TimeToStr(IncSecond(StrToTime(hms), 1))
  6. end;
  7. begin
  8. writeln(f('00:00:00'));
  9. writeln(f('23:59:59'));
  10. end.
Success #stdin #stdout 0s 5308KB
stdin
Standard input is empty
stdout
00:00:01
00:00:00