Consider the borders of the IO-Link TimeT value range:

• If the OPC UA DateTime value is equal or greater than 2120-02-07 6:28,15 (UTC), the IO-Link TimeT value shall be 2120-02-07 6:28,15 (UTC), seconds value: 0x9DFF4399, fractional seconds value 0xFFFFFFFF).
• If the OPC UA DateTime value is equal or smaller than 1984-01-01 0:00,00 (UTC), the IO-Link TimeT value shall be 1984-01-01 0:00,00 (UTC), seconds value: 0x9DFF4400, fractional seconds value: 0).

If none of the rules above apply, the IO-Link TimeT rollover has to be considered:

• If the OPC UA DateTime value is equal or greater than 2036-02-07 6.28,16 (UTC), the time base offset has to be the difference between 1601-01-01 0:00:00 and 2036-02-07 6.28,16 (UTC).
• If the OPC UA DateTime value is smaller than 2036-02-07 6.28,16 (UTC), the time base offset has to be the difference between 1601-01-01 0:00:00 and 1901-01-01 0:00:00 (UTC).

The time value conversion works according to the following formulas: