How do we get length of service from backend

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Hi All,

How can we get the Length of Service based on any specific date from backend. When we navigate seniority date screen (V3), seniority date is always calculated as on last process run date. (If the process is scheduled to run daily it displays LOS as on today's date)

Our requirement is to get that based on 1 Jan of the year or any other specific date for that matter,

Is it possible to get that? 

Thanks