From 84ced681a24c5ea7223f8f33554eb42266baab60 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Tue, 29 Mar 2022 19:10:44 -0400
Subject: datetime: Drop newly unused use of timegm()

It's non-standard.
---
diff --git a/TODO b/TODO
index 0a038a3..2089ee9 100644
--- a/TODO
+++ b/TODO
@@ -1,4 +1,3 @@
-drop timegm()
 try to fix dst bug
 test with other libc's (newlib? musl? fbsd? obsd?)
 `./@ 7:00 PM` doesn't work with musl strptime()
diff --git a/configure.ac b/configure.ac
index 133e8ee..40a3205 100644
--- a/configure.ac
+++ b/configure.ac
@@ -42,7 +42,7 @@ AC_CHECK_FUNCS(
 	[\
 		calloc difftime fprintf fputs free isspace localtime mktime \
 		printf realloc setvbuf sleep strerror strlen strftime strptime \
-		time timegm
+		time
 	],
 	[],
 	[funcs_missing=true])
diff --git a/src/datetime.c b/src/datetime.c
index 2c971a4..0bba344 100644
--- a/src/datetime.c
+++ b/src/datetime.c
@@ -33,18 +33,6 @@
 #include "datetime.h"
 #include "formats.h"
 
-static struct tm DATETIME_EPOCH_ = {
-	.tm_sec   = 0,
-	.tm_min   = 0,
-	.tm_hour  = 0,
-	.tm_mday  = 1,
-	.tm_mon   = 0,
-	.tm_year  = 70,
-	.tm_wday  = 4,
-	.tm_yday  = 0,
-	.tm_isdst = -1,
-};
-
 static void
 _datetime_buf_cpy_p(char *dst, const char *src)
 {
@@ -403,13 +391,3 @@ datetime_strftime_misc(const struct tm *tm, char **out, size_t *buf_sz,
 
 	return _datetime_strftime(FORMATS_MISC, tm, out, buf_sz, buf, i);
 }
-
-double
-datetime_diff_epoch(time_t t)
-{
-	time_t epoch;
-
-	epoch = timegm(&DATETIME_EPOCH_);
-
-	return difftime(t, epoch);
-}
diff --git a/src/datetime.h b/src/datetime.h
index 9de8799..1094cf8 100644
--- a/src/datetime.h
+++ b/src/datetime.h
@@ -38,7 +38,4 @@ int
 datetime_strftime_misc(const struct tm *tm, char **out, size_t *out_sz,
 		char **buf, size_t *i);
 
-double
-datetime_diff_epoch(time_t t);
-
 #endif  /* DATETIME_H_ */
--
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