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Use UTC instead of GMT #53

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6 changes: 3 additions & 3 deletions USAGE.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@ Calculate sunrise and sunset times for the current or targetted day.
The times can be adjusted either for twilight or fixed durations.

The program can either: wait for sunrise or sunset (function: wait),
or return the time (GMT or local) the event occurs (function: list),
or return the time (UTC or local) the event occurs (function: list),
or report the day length and twilight timings (function: report),
or simply report if it is DAY or NIGHT (function: poll).

Expand All @@ -21,7 +21,7 @@ Minor options, any of:
[no]debug Print extra info and returns in one minute. Default: nodebug.
[no]version Print the version number. Default: noversion.
[no]help Print this help. Default: nohelp.
[no]gmt Print times in GMT or local-time. Default: nogmt.
[no]gmt Print times in UTC or local-time. Default: nogmt.

Twilight types, either:
daylight Top of sun just below the horizon. Default.
Expand Down Expand Up @@ -61,7 +61,7 @@ Indicate by program exit-code if is Day or Night using a custom twilight angle o

Example 4: sunwait list 7 gmt sunrise angle 3
List next 7 days sunrise times, custom +3 degree twilight angle, default location.
Uses GMT; as any change in daylight saving over the specified period is not considered.
Uses UTC; as any change in daylight saving over the specified period is not considered.

Example 5: sunwait report y 20 m 3 d 15 10.49S 105.55E
Produce a report of the different sunrises and sunsets on an arbitrary day (2022/03/15) for an arbitrary location (Christmas Island)
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12 changes: 6 additions & 6 deletions sunwait.c
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Expand Up @@ -89,7 +89,7 @@ static void print_usage ()
printf ("The times can be adjusted either for twilight or fixed durations.\n");
printf ("\n");
printf ("The program can either: wait for sunrise or sunset (function: wait),\n");
printf (" or return the time (GMT or local) the event occurs (function: list),\n");
printf (" or return the time (UTC or local) the event occurs (function: list),\n");
printf (" or report the day length and twilight timings (function: report),\n");
printf (" or simply report if it is DAY or NIGHT (function: poll).\n");
printf ("\n");
Expand All @@ -108,7 +108,7 @@ static void print_usage ()
printf (" [no]debug Print extra info and returns in one minute. Default: nodebug.\n");
printf (" [no]version Print the version number. Default: noversion.\n");
printf (" [no]help Print this help. Default: nohelp.\n");
printf (" [no]gmt Print times in GMT or local-time. Default: nogmt.\n");
printf (" [no]utc Print times in UTC or local-time. Default: noutc.\n");
printf ("\n");
printf ("Twilight types, either:\n");
printf (" daylight Top of sun just below the horizon. Default.\n");
Expand Down Expand Up @@ -146,9 +146,9 @@ static void print_usage ()
printf ("Example 3: sunwait poll exit angle 10 54.897786N -1.517536E\n");
printf ("Indicate by program exit-code if is Day or Night using a custom twilight angle of 10 degrees above horizon. Washington, UK.\n");
printf ("\n");
printf ("Example 4: sunwait list 7 gmt sunrise angle 3\n");
printf ("Example 4: sunwait list 7 UTC sunrise angle 3\n");
printf ("List next 7 days sunrise times, custom +3 degree twilight angle, default location.\n");
printf ("Uses GMT; as any change in daylight saving over the specified period is not considered.\n");
printf ("Uses UTC; as any change in daylight saving over the specified period is not considered.\n");
printf ("\n");
printf ("Note that program uses C library functions to determine time and localtime.\n");
printf ("Error for timings are estimated at: +/- 4 minutes.\n");
Expand Down Expand Up @@ -350,7 +350,7 @@ static bool isOffset (runStruct *pRun, const char *pArg)
}

/*
** time_t converted to struct tm. Using GMT (UTC) time.
** time_t converted to struct tm. Using UTC time.
*/
void myUtcTime (const time_t *pTimet, struct tm *pTm)
{
Expand Down Expand Up @@ -609,7 +609,7 @@ int main (int argc, char *argv[])

// Minor Options

// Print output in GMT or local-time
// Print output in UTC or local-time
else if (!strcmp (arg, "gmt") ||
!strcmp (arg, "utc")) pRun->utc = ONOFF_ON;
else if (!strcmp (arg, "nogmt") ||
Expand Down
2 changes: 1 addition & 1 deletion sunwait.h
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Expand Up @@ -45,7 +45,7 @@ typedef struct
OnOff functionPoll; // User wants a "NIGHT" or "DAY" return code/text
OnOff functionWait; // User wants the program to wait until sunrise or sunset

OnOff utc; // Printed output is in GMT/UTC (on) or localtime (off)
OnOff utc; // Printed output is in UTC (on) or localtime (off)
OnOff debug; // Is debug output required

OnOff reportSunrise; // Report sun rising
Expand Down