A utility to run executables as if it were a given date/time
Uses LD_PRELOAD to load this library and hijack time() syscalls to feed the caller the specified timestamp.
There are 2 components: preload is the binary to be run directly (per usage below) and libld_preload_rust.so is the dynamic library that is loaded before your desired child executable is run. The .so must be in the same directory as preload.
The desired date/time is passed to preload as the first argument and can be a Unix epoch timestamp or an RFC3339 string.
The second argument is the path to the child executable.
./preload timestamp child_binary
e.g.:
./preload 2147483647 /path/to/my/binary
./preload 2038-01-19T03:14:07Z /path/to/my/binary
./preload 2001-12-31T23:59:59-05:00 /path/to/my/binary
simple.c is included as a simple executable that prints the current date and time, for testing.