Keywords in syntax file

hi, I am trying to write my own syntax for log file of one system..
my problem is: All the keywords contains colon (:) for example "At:" or
"Subject:"
but setting:
syn keyword date At:
doesn't work
but:
syn keyword date At
works fine..
I tried 'At:' "At:" At\: ...but no success

Any clue?
thanks

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