And standard library design errors also. Properly designed date/time API invented relatively recently. System.DateTime (.NET) - 2002 | System.DateTimeOffset -

And standard library design errors also. Properly designed date/time API invented relatively recently. System.DateTime (.NET) - 2002 | System.DateTimeOffset - 2005 Joda time (JVM) - 2005 | java.time - 2014 Temporal (JavaScript) - still experimental