raise 400 if given a year prior to 1900 for the datespan
raise 400 if given a year prior to 1900 for the datespan

qedsoftware/commcare-hq,qedsoftware/commcare-hq,gmimano/commcaretest,dimagi/commcare-hq,qedsoftware/commcare-hq,qedsoftware/commcare-hq,SEL-Columbia/commcare-hq,gmimano/commcaretest,puttarajubr/commcare-hq,dimagi/commcare-hq,qedsoftware/commcare-hq,SEL-Columbia/commcare-hq,puttarajubr/commcare-hq,dimagi/commcare-hq,gmimano/commcaretest,dimagi/commcare-hq,puttarajubr/commcare-hq,puttarajubr/commcare-hq,SEL-Columbia/commcare-hq,dimagi/commcare-hq