timestamp_t is no longer tied to the wall clock time (so it can be
read from CLOCK_MONOTONIC or any other clock)
ucw_time_t was an obsolete hack
typedef int64_t s64; /** Exactly 64 bits, signed **/
typedef unsigned int uns; /** A better pronounceable alias for `unsigned int` **/
-typedef u32 ucw_time_t; /** Seconds since UNIX epoch **/
-typedef s64 timestamp_t; /** Milliseconds since UNIX epoch **/
+typedef s64 timestamp_t; /** Milliseconds since an unknown epoch **/
#ifdef CONFIG_UCW_LARGE_FILES
typedef s64 ucw_off_t; /** File position (either 32- or 64-bit, depending on `CONFIG_UCW_LARGE_FILES`). **/