Computing lengths of service
Primary source
Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.
Full Text
(a) The smallest unit of time that OPM will calculate in computing a formula in a court order is a month, even where the court order directs OPM to make a more precise calculation.
(b) If the court order states a formula using a specified simple or decimal fraction other than twelfth parts of a year, OPM will use the specified number to perform simple mathematical computations.
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.