In Saudi Arabia the official calendar is Um Alqura calendar, which is a Hejeri based calendar.
The idea is to buy the royalties of the calculation function (KACST owns it), and open it, and force all software vendors to include it.
Just imagine that your mobile date, match your outlook date, match your favourite website date. Stakeholders:
Government: KACST, CITC, Yesser, MCIT Software vendors: Microsoft, Oracle, SAP, Sun, Apple Open Source: Linux, MySQL, Postgresql etc.