[SAC-HELP] cannot add sac header

[Rakotoarisaona Hasiniaina]

Dear all,

I am trying to set some times and date in a SAC header. So far I did the 
following:

SAC> ch O GMT 2006 001 14 34 01 23
SAC> wh

Although  all of these change do not appear with "lh" command. Also, when I am  
doing the picking and write it into "hpf", I have got no error but when  open 
the HPF file and it is empty.
Is anyone can help me in this matter?

(PS: I have been converted my data from ascii to sac using the fortran code 
amp2sac in this link http://web.utah.edu/thorne/software.html)

Thank you in advance for your help.
Kind regards,
Hasina
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