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The negation operator is a null task operator not a unary operator.
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time(2) [minix man page]

TIME(2) 							System Calls Manual							   TIME(2)

NAME
time, stime - get/set date and time SYNOPSIS
#include <sys/types.h> #include <time.h> time_t time(time_t *tp) int stime(time_t *tp) DESCRIPTION
The system's notion of the current Greenwich time is obtained with the time call, and set with the stime call. The time is expressed in seconds since midnight (0 hour), January 1, 1970. The time is both returned by time and stored in the variable pointed to by tp unless tp is the null pointer. Stime obtains the time to set from the variable pointed to by tp. Only the super-user may set the time of day. RETURN
A 0 return value from stime indicates that the call succeeded. Time returns the current time on success. A -1 return value indicates an error occurred, and in this case an error code is stored into the global variable errno. ERRORS
The following error codes may be set in errno: [EFAULT] The tp address referenced invalid memory. [EPERM] A user other than the super-user attempted to set the time. SEE ALSO
date(1), ctime(3). 4th Berkeley Distribution May 14, 1986 TIME(2)

Check Out this Related Man Page

TIME(3F)																  TIME(3F)

NAME
time, ctime, ltime, gmtime - return system time SYNOPSIS
integer function time() character*(*) function ctime (stime) integer stime subroutine ltime (stime, tarray) integer stime, tarray(9) subroutine gmtime (stime, tarray) integer stime, tarray(9) DESCRIPTION
Time returns the time since 00:00:00 GMT, Jan. 1, 1970, measured in seconds. This is the value of the UNIX system clock. Ctime converts a system time to a 24 character ASCII string. The format is described under ctime(3). No 'newline' or NULL will be included. Ltime and gmtime disect a UNIX time into month, day, etc., either for the local time zone or as GMT. The order and meaning of each element returned in tarray is described under ctime(3). FILES
/usr/lib/libU77.a SEE ALSO
ctime(3), itime(3F), idate(3F), fdate(3F) 4.2 Berkeley Distribution May 15, 1985 TIME(3F)

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