/// <summary> /// Tests if two given periods overlap each other. /// </summary> /// <param name="BS">Base period start</param> /// <param name="BE">Base period end</param> /// <param name="TS">Test period start</param> /// <param name="TE">Test period end</param> /// <returns> /// <c>true</c> if the periods overlap; otherwise, <c>false</c>. /// </returns> public bool TimePeriodOverlap(DateTime BS, DateTime BE, DateTime TS, DateTime TE) { // More simple? // return !((TS < BS && TE < BS) || (TS > BE && TE > BE)); // The version below, without comments /* return ( (TS >= BS && TS < BE) || (TE <= BE && TE > BS) || (TS <= BS && TE >= BE) ); */ return ( // 1. Case: // // TS-------TE // BS------BE // // TS is after BS but before BE (TS >= BS && TS < BE) || // or // 2. Case // // TS-------TE // BS---------BE // // TE is before BE but after BS (TE <= BE && TE > BS) || // or // 3. Case // // TS----------TE // BS----BE // // TS is before BS and TE is after BE (TS <= BS && TE >= BE) ); }