Function current_time_ms 

pub fn current_time_ms() -> u64

Available on crate feature client only.

Returns the current time as milliseconds since the UNIX epoch.

Used internally by gc() and other time-sensitive operations. Exposed so callers can cache the value and pass it to gc_with_time() to avoid repeated syscalls.

Clock-before-epoch fallback

duration_since(UNIX_EPOCH) errors if the system clock reports a time before the Unix epoch (1970-01-01 UTC) — e.g. a misconfigured RTC or a clock skewed backwards on cold boot. The .unwrap_or_default() silently clamps that case to a Duration::ZERO, i.e. this function returns 0. That 0 is treated as “ancient” by GC, so the only observable effect is that entries become immediately eligible for garbage collection for the duration of the clock anomaly; no panic, no error propagation. This is a deliberate silent clamp rather than a propagating error because every caller treats now_ms as infallible and time-sensitive operations degrading to “collect now” is the safest default under a broken clock.