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In QGIS 3.6.1 Noosa I have a column in the attribute table (Install Date) formatted as DATE that I want to add 100 or 60 years (Replacement Date) to, also in DATE format, for use in Time Manager.

I have tried creating a new field in the Field Calculator but get NULL values out. Expression used was todate("Install_Da"+'100 Years").

I can get a result using Integer formats using left(Install_Da,4) then another column adding 100 years but then it doesn't run in Time Manager due to wrong format.

What is the proper way to add years to a date?

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You need to change the 60 or 100 years to an interval:

"Install_Da" + to_interval('60 years')

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