From eb8dbc0d4cddd1161e2b02d7973985a36e2efc95 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Fri, 18 Mar 2022 20:31:27 -0400
Subject: datetime: Get now (struct tm) from caller

---
diff --git a/src/datetime.c b/src/datetime.c
index 59adcb9..27c27a2 100644
--- a/src/datetime.c
+++ b/src/datetime.c
@@ -117,14 +117,9 @@ _datetime_reset_tm(struct tm *tm)
 }
 
 static void
-_datetime_normalize(struct tm *arg_tm, time_t *arg_sec)
+_datetime_normalize(struct tm *now_tm, struct tm *arg_tm, time_t *arg_sec)
 {
-	time_t     now_sec;
-	struct tm *now_tm;
-	int        wday;
-
-	now_sec = time(NULL);
-	now_tm = localtime(&now_sec);
+	int wday;
 
 	if (arg_tm->tm_sec == INT_MIN) {
 		arg_tm->tm_sec = 0;
@@ -177,7 +172,7 @@ _datetime_normalize(struct tm *arg_tm, time_t *arg_sec)
 }
 
 int
-datetime_parse(const char *input, time_t *arg_sec)
+datetime_parse(struct tm *now_tm, const char *input, time_t *arg_sec)
 {
 	int        date_fmt_len;
 	int        time_fmt_len;
@@ -207,7 +202,7 @@ datetime_parse(const char *input, time_t *arg_sec)
 			end = strptime(input, fmt_buf, &arg_tm);
 			if (end != NULL && *end == '\0') {
 				free(fmt_buf);
-				_datetime_normalize(&arg_tm, arg_sec);
+				_datetime_normalize(now_tm, &arg_tm, arg_sec);
 				return 0;
 			}
 		}
@@ -223,7 +218,7 @@ datetime_parse(const char *input, time_t *arg_sec)
 			end = strptime(input, fmt_buf, &arg_tm);
 			if (end != NULL && *end == '\0') {
 				free(fmt_buf);
-				_datetime_normalize(&arg_tm, arg_sec);
+				_datetime_normalize(now_tm, &arg_tm, arg_sec);
 				return 0;
 			}
 		}
@@ -234,7 +229,7 @@ datetime_parse(const char *input, time_t *arg_sec)
 		end = strptime(input, DATETIME_MISC_FMTS_[d], &arg_tm);
 		if (end != NULL && *end == '\0') {
 			free(fmt_buf);
-			_datetime_normalize(&arg_tm, arg_sec);
+			_datetime_normalize(now_tm, &arg_tm, arg_sec);
 			return 0;
 		}
 	}
diff --git a/src/datetime.h b/src/datetime.h
index edff8f7..554748b 100644
--- a/src/datetime.h
+++ b/src/datetime.h
@@ -23,7 +23,7 @@
 #include <time.h>
 
 int
-datetime_parse(const char *input, time_t *arg_sec);
+datetime_parse(struct tm *now_tm, const char *input, time_t *arg_sec);
 
 int
 datetime_strftime_date(const struct tm *tm, char **out, size_t *out_sz,
diff --git a/src/main.c b/src/main.c
index 8740753..c8e90f4 100644
--- a/src/main.c
+++ b/src/main.c
@@ -181,12 +181,13 @@ _concat_args(int argc, char * const argv[])
 int
 main(int argc, char * const argv[])
 {
-	bool    dbg;
-	int     opt;
-	char   *buf;
-	time_t  arg;
-	time_t  now;
-	double  dif;
+	bool       dbg;
+	int        opt;
+	char      *buf;
+	time_t     now;
+	struct tm *now_tm_p;
+	time_t     arg;
+	double     dif;
 
 	dbg = false;
 	optind = 1;
@@ -229,7 +230,10 @@ main(int argc, char * const argv[])
 		return EXIT_FAILURE;
 	}
 
-	if (datetime_parse(buf, &arg) < 0) {
+	now = time(NULL);
+	now_tm_p = localtime(&now);
+
+	if (datetime_parse(now_tm_p, buf, &arg) < 0) {
 		free(buf);
 		return EXIT_FAILURE;
 	}
--
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