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[SIC\]COMPUTE Modification_Date DATE Filename
Return the last modification date of the file Filename into the integer
variable Modification_Date. Used in procedures to check when file has
last been changed.
If the output variable is a 4-bytes integer (Fortran I*4), returned val-
ue is in seconds since 01-jan-1970. If the variable is a 8-bytes integer
(Fortran I*8), returned value is in nanoseconds since 01-jan-1970. In
the latter case, your system (e.g. Linux >= 2.5.48) AND filesystem (e.g.
ext4) must support timestamp granularity below the second. If not, value
precision is limited to 1 second.