From ff85325886a9441fd77f1a78e05d11cd3838fe24 Mon Sep 17 00:00:00 2001
From: Dianne Skoll <dianne@skoll.ca>
Date: Wed, 1 Jan 2020 18:00:22 -0500
Subject: [PATCH] Support DATETIME - TIME

---
 man/remind.1 | 8 +++++---
 src/expr.c   | 5 +++--
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/man/remind.1 b/man/remind.1
index f764d6f1..482e6633 100644
--- a/man/remind.1
+++ b/man/remind.1
@@ -1761,9 +1761,11 @@ the original \fBDATE\fR.
 earlier
 than the original \fBTIME\fR.
 .PP
-\fBDATETIME\fR - \fBINT\fR - returns a \fBDATETIME\fR that is \fBINT\fR minutes
-earlier
-than the original \fBDATETIME\fR.
+\fBDATETIME\fR - \fBINT\fR - returns a \fBDATETIME\fR that is
+\fBINT\fR minutes earlier than the original \fBDATETIME\fR.
+.PP
+\fBDATETIME\fR - \fBTIME\fR - coerces the \fBTIME\fR to an \fBINT\fR
+and then performs subtraction as above.
 .RE
 .TP
 .B <, <=, >, and >=
diff --git a/src/expr.c b/src/expr.c
index 4d57051e..595324e3 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -854,8 +854,9 @@ static int Subtract(void)
 	return OK;
     }
 
-    /* If it's a datetime minus an int, do subtraction, checking for underflow */
-    if (v1.type == DATETIME_TYPE && v2.type == INT_TYPE) {
+    /* If it's a datetime minus an int or a time, do subtraction,
+     * checking for underflow */
+    if (v1.type == DATETIME_TYPE && (v2.type == INT_TYPE || v2.type == TIME_TYPE)) {
 	v1.v.val -= v2.v.val;
 	if (v1.v.val < 0) return E_DATE_OVER;
 	PushValStack(v1);