sign.c

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/*
 * Copyright (C) 1995.  Bill Brown <brown@gis.uiuc.edu> & Michael Shapiro
 *
 * This program is free software under the GPL (>=v2)
 * Read the file GPL.TXT coming with GRASS for details.
 */
#include <grass/datetime.h>


int datetime_is_positive(const DateTime * dt)
{
    return dt->positive != 0;
}

int datetime_is_negative(const DateTime * dt)
{
    return dt->positive == 0;
}


void datetime_set_positive(DateTime * dt)
{
    dt->positive = 1;
}


void datetime_set_negative(DateTime * dt)
{
    dt->positive = 0;
}


void datetime_invert_sign(DateTime * dt)
{
    dt->positive = !dt->positive;
}