fix time convert overflow checks

lib/src/time.rs

@@ -20,13 +20,14 @@ pub fn from_float<T>(time:f64)->Result<Time<T>,Error>{
 		core::num::FpCategory::Infinite
 		|core::num::FpCategory::Subnormal
 		|core::num::FpCategory::Normal=>{
-			if time<Time::<T>::MIN.get() as f64{
+			let time_raw=time*Time::<T>::ONE_SECOND.get() as f64;
+			if time_raw<Time::<T>::MIN.get() as f64{
 				return Err(Error::Underflow);
 			}
-			if (Time::<T>::MAX.get() as f64)<time{
+			if (Time::<T>::MAX.get() as f64)<time_raw{
 				return Err(Error::Overflow);
 			}
-			Ok(Time::raw((time*Time::<T>::ONE_SECOND.get() as f64) as i64))
+			Ok(Time::raw(time_raw as i64))
 		}
 	}
 }