_RL snowprecipstartdate
& snowprecipperiod, snowprecipstartdate,
& snowprecipfile, snowprecipstartdate, snowprecipperiod,
CALL CAL_TOSECONDS ( difftime, snowprecipstartdate ,myThid)
snowprecipstartdate=modelstart + snowprecipstartdate
snowprecipstartdate= 0.