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time/day and C only

Posted on 2001-06-30
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Last Modified: 2010-04-21

I want to make a greeting, in Linux (C program only)like

if hour is > 18PM and < 22PM
print "good evening, today is Wednesday. in year 2001 has 200 days remaining, time now is %s", time$);

if hour is > 4AM and <8AM
print "good morning, today is Friday. in year 2001 has 172 days remaining, time now is %s", time$);

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Question by:16bits
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2 Comments
 
LVL 8

Accepted Solution

by:
mnashadka earned 200 total points
ID: 6241458
Try something like:
time_t now;
struct tm *time_struct;
char day_str[20];
char time_str[20];

now = time(NULL);
time_struct = mktime(&now);

strftime(day_str, 20, "%a", time_struct);
strftime(time_str, 20, "%H:%M:%S", time_struct);

if(time_struct->
tm_hour > 18 && time_struct->tm_hour < 22)
{
  printf("Good evening, today is %s in year %d, it is the %d day of the year, time now is %s", day_str, time_struct->tm_year, time_struct->yday, time_str);
}
else if(time_struct->
tm_hour > 4 && time_struct->
tm_hour < 8)
{
  printf("Good morning, today is %s in year %d, it is the %d day of the year, time now is %s", day_str, time_struct->tm_year, time_struct->yday, time_str);
}

Note, this doesn't give you the number of days remaing.  To do this, you need to figure out the number of days in the year and subtract time_struct->yday from that.  Hope this helps.    
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Author Comment

by:16bits
ID: 6241637
it actually helps a lot, thank you!
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