Confused about the example of FHIST run with result of B1850

[zhangmeixin]

Hello! I have seen the tutorial test: 3: Starting FHIST from spunup state in 1850 — CESM Tutorial
the default period of FHIST is 1979-2014, the run startdate has been changed to 1850 in the example.

I am confused about that the date 1850-01-01 is out of the period 1979-2014 if doing so, What the meaning of period 1979-2014?
What the run result of the change? Is it from 1850 and then follow it?

 

[hannay]

The default period for FHIST is 1979-2014. It means that by default you will get:
RUN_STARTDATE=1979-01-01.

But nothing prevents you to start at another date. in the example, you are starting
RUN_STARTDATE=1850-01-01.

 

[zhangmeixin]

The default period for FHIST is 1979-2014. It means that by default you will get:
RUN_STARTDATE=1979-01-01.

But nothing prevents you to start at another date. in the example, you are starting
RUN_STARTDATE=1850-01-01.

Thanks for your instant reply！I dont konw whether my understanding is wrong: the run period of model depends on the initial time and inputdata and time i set, if i provide the initial time and inputdata in the run time i set, it can run?
For examle, The default period of FCHIST is 2010-2014, I can run the model from the initial time of 2000 if i provide the initial field?