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SwRI can revise these Terms at any time * without notice by updating this posting. * * Trademarks * * The SwRI logo is a trademark of SwRI in the United States and other countries. * */ #ident "@(#) $Id: delta_combo.c 22018 2012-12-05 18:59:24Z carrie $ SwRI" #include "libbase_idfs.h" /******************************************************************************* * * * IR_COMPUTE_DELTA_COMBO SUBROUTINE * * * * DESCRIPTION * * This routine is called to convert the time duration for the delta-t * * period being processed into a single value in terms of seconds. * * * * INPUT VARIABLES * * struct time_span structure that holds the time period for * * src_time the current delta-t being processed * * * * USAGE * * x = ir_compute_delta_combo (src_time) * * * * NECESSARY SUBPROGRAMS * * None * * * * EXTERNAL VARIABLES * * None * * * * INTERNAL VARIABLES * * SDDAS_DOUBLE delta_combo the delta-t period combined into seconds * * SDDAS_LONG delta_milli the time of day difference for delta-t * * SDDAS_LONG delta_nano time of day residual difference for delta-t * * SDDAS_SHORT delta_year the year difference for the delta-t duration* * SDDAS_SHORT delta_day the day difference for the delta-t duration * * * * SUBSYSTEM * * Display Level * * * ******************************************************************************/ SDDAS_DOUBLE ir_compute_delta_combo (struct time_span src_time) { SDDAS_DOUBLE delta_combo; SDDAS_LONG delta_milli, delta_nano; SDDAS_SHORT delta_year, delta_day; /**************************************************************************/ /* The following converts the time duration for the delta-t period */ /* being processed into a single value in terms of seconds. */ /**************************************************************************/ delta_year = src_time.eyear - src_time.byear; delta_day = src_time.eday - src_time.bday; delta_milli = src_time.emilli - src_time.bmilli; delta_nano = src_time.enano - src_time.bnano; if (delta_nano < 0) { --delta_milli; delta_nano += 1000000; /* 1 milli = 1000000 nanoseconds */ } delta_combo = (delta_year * src_time.bdays_in_yr * 86400) + delta_day * 86400 + (delta_milli / 1000.0) + (delta_nano / 1000000000.0); return (delta_combo); }