x         y sec
-         0 (error)
123       0 (error)
-123      0 (error)
123h      0 442800
-123h     0 -442800
123h4s    0 442804
-123h4s   0 -442804
1h2h3m4s  0 10984
-1h2h3m4s 0 -10984
1h3m4s    0 3784
-1h3m4s   0 -3784
