100. Timestamp 相关函数

$ awk 'BEGIN { print systime() }'
1299345651

$ awk 'BEGIN { print strftime("%c",systime()) }'
Sat 05 Mar 2011 09:21:10 AM PST

$ cat strftime.awk
BEGIN {
    print "--- basic formats --"
    print strftime("Format 1: %m/%d/%Y %H:%M:%S",systime())
    print strftime("Format 2: %m/%d/%y %I:%M:%S %p",systime())
    print strftime("Format 3: %m-%b-%Y %H:%M:%S",systime())
    print strftime("Format 4: %m-%b-%Y %H:%M:%S %Z",systime())
    print strftime("Format 5: %a %b %d %H:%M:%S %Z %Y",systime())
    print strftime("Format 6: %A %B %d %H:%M:%S %Z %Y",systime())
    print "--- quick formats --"
    print strftime("Format 7: %c",systime())
    print strftime("Format 8: %D",systime())
    print strftime("Format 8: %F",systime())
    print strftime("Format 9: %T",systime())
    print strftime("Format 10: %x",systime())
    print strftime("Format 11: %X",systime())
    print "--- single line format with %t--"
    print strftime("%Y %t%B %t%d",systime())
    print "--- multi line format with %n --"
    print strftime("%Y%n%B%n%d",systime())
}

$ awk -f strftime.awk
--- basic formats --
Format 1: 03/05/2011 09:26:03
Format 2: 03/05/11 09:26:03 AM
Format 3: 03-Mar-2011 09:26:03
Format 4: 03-Mar-2011 09:26:03 PST
Format 5: Sat Mar 05 09:26:03 PST 2011
Format 6: Saturday March 05 09:26:03 PST 2011
--- quick formats --
Format 7: Sat 05 Mar 2011 09:26:03 AM PST
Format 8: 03/05/11
Format 8: 2011-03-05
Format 9: 09:26:03
Format 10: 03/05/2011
Format 11: 09:26:03 AM
--- single line format with %t--
2011 March 05
--- multi line format with %n --
2011
March
05