[gradsusr] how to set t with dates

[एन नरेंद्र रेड्डी]

I have long term data starting from 2000. I need to plot 2D plot for
specific time. I am calculating value of "t" every time. I am finding
lot of difficulty to do this.

Is it possible to give time and date in SET t command . If it is
possible please let me know the format.

Thanks in advance
Narendra

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