Merge pull request #1569 from mustrumr/date-parse-additions

Date parse additions

7 files changed, 260 insertions, 118 deletions

diff --git a/man/systemd.time.xml b/man/systemd.time.xml
index 64358351d5..826e9fc5a5 100644
--- a/man/systemd.time.xml
+++ b/man/systemd.time.xml
@@ -117,10 +117,11 @@
   <refsect1>
     <title>Parsing Timestamps</title>
 
-    <para>When parsing systemd will accept a similar timestamp syntax,
-    but excluding any timezone specification (this limitation might be
-    removed eventually). The weekday specification is optional, but
-    when the weekday is specified it must either be in the abbreviated
+    <para>When parsing systemd will accept a similar syntax, but expects
+    no timezone specification, unless it is given as the literal string
+    "UTC". In this case the time is considered in UTC time, otherwise in
+    the local timezone. The weekday specification is optional, but when
+    the weekday is specified it must either be in the abbreviated
     (<literal>Wed</literal>) or non-abbreviated
     (<literal>Wednesday</literal>) English language form (case does
     not matter), and is not subject to the locale choice of the user.
@@ -157,22 +158,29 @@
     00:00.</para>
 
     <para>Examples for valid timestamps and their normalized form
-    (assuming the current time was 2012-11-23 18:15:22):</para>
+    (assuming the current time was 2012-11-23 18:15:22 and the timezone
+    was UTC+8, for example TZ=Asia/Shanghai):</para>
 
     <programlisting>Fri 2012-11-23 11:12:13 → Fri 2012-11-23 11:12:13
     2012-11-23 11:12:13 → Fri 2012-11-23 11:12:13
-       2012-11-23 → Fri 2012-11-23 00:00:00
-         12-11-23 → Fri 2012-11-23 00:00:00
-         11:12:13 → Fri 2012-11-23 11:12:13
-      11:12 → Fri 2012-11-23 11:12:00
-        now → Fri 2012-11-23 18:15:22
-      today → Fri 2012-11-23 00:00:00
-        yesterday → Fri 2012-11-22 00:00:00
-         tomorrow → Fri 2012-11-24 00:00:00
-         +3h30min → Fri 2012-11-23 21:45:22
-        -5s → Fri 2012-11-23 18:15:17
-        11min ago → Fri 2012-11-23 18:04:22
-      @1395716396 → Tue 2014-03-25 03:59:56</programlisting>
+2012-11-23 11:12:13 UTC → Fri 2012-11-23 19:12:13
+             2012-11-23 → Fri 2012-11-23 00:00:00
+               12-11-23 → Fri 2012-11-23 00:00:00
+               11:12:13 → Fri 2012-11-23 11:12:13
+       11:12:13.9900009 → Fri 2012-11-23 11:12:13
+                          format_timestamp_us: Fri 2012-11-23 11:12:13.990000
+                  11:12 → Fri 2012-11-23 11:12:00
+                    now → Fri 2012-11-23 18:15:22
+                  today → Fri 2012-11-23 00:00:00
+              today UTC → Fri 2012-11-23 16:00:00
+              yesterday → Fri 2012-11-22 00:00:00
+               tomorrow → Fri 2012-11-24 00:00:00
+               +3h30min → Fri 2012-11-23 21:45:22
+           +3h30min UTC → -EINVAL
+                    -5s → Fri 2012-11-23 18:15:17
+              11min ago → Fri 2012-11-23 18:04:22
+          11min ago UTC → -EINVAL
+            @1395716396 → Tue 2014-03-25 03:59:56</programlisting>
 
     <para>Note that timestamps printed by systemd will not be parsed
     correctly by systemd, as the timezone specification is not
@@ -226,7 +234,8 @@
     second component is not specified, <literal>:00</literal> is
     assumed.</para>
 
-    <para>Timezone names may not be specified.</para>
+    <para>A timezone specification is not expected, unless it is given
+    as the literal string "UTC", similarly to timestamps.</para>
 
     <para>The special expressions
     <literal>minutely</literal>,
@@ -242,7 +251,7 @@
     <literal>*-*-01 00:00:00</literal>,
     <literal>Mon *-*-* 00:00:00</literal>,
     <literal>*-01-01 00:00:00</literal>,
-    <literal>*-01,04,07,10-01 00:00:0</literal> and
+    <literal>*-01,04,07,10-01 00:00:00</literal> and
     <literal>*-01,07-01 00:00:00</literal> respectively.
     </para>
 
@@ -251,31 +260,33 @@
 
 <programlisting>   Sat,Thu,Mon-Wed,Sat-Sun → Mon-Thu,Sat,Sun *-*-* 00:00:00
      Mon,Sun 12-*-* 2,1:23 → Mon,Sun 2012-*-* 01,02:23:00
-       Wed *-1 → Wed *-*-01 00:00:00
-     Wed-Wed,Wed *-1 → Wed *-*-01 00:00:00
-    Wed, 17:48 → Wed *-*-* 17:48:00
+                   Wed *-1 → Wed *-*-01 00:00:00
+           Wed-Wed,Wed *-1 → Wed *-*-01 00:00:00
+                Wed, 17:48 → Wed *-*-* 17:48:00
 Wed-Sat,Tue 12-10-15 1:2:3 → Tue-Sat 2012-10-15 01:02:03
-         *-*-7 0:0:0 → *-*-07 00:00:00
-         10-15 → *-10-15 00:00:00
+               *-*-7 0:0:0 → *-*-07 00:00:00
+                     10-15 → *-10-15 00:00:00
        monday *-12-* 17:00 → Mon *-12-* 17:00:00
  Mon,Fri *-*-3,1,2 *:30:45 → Mon,Fri *-*-01,02,03 *:30:45
       12,14,13,12:20,10,30 → *-*-* 12,13,14:10,20,30:00
  mon,fri *-1/2-1,3 *:30:45 → Mon,Fri *-01/2-01,03 *:30:45
-      03-05 08:05:40 → *-03-05 08:05:40
-      08:05:40 → *-*-* 08:05:40
-         05:40 → *-*-* 05:40:00
+            03-05 08:05:40 → *-03-05 08:05:40
+                  08:05:40 → *-*-* 08:05:40
+                     05:40 → *-*-* 05:40:00
     Sat,Sun 12-05 08:05:40 → Sat,Sun *-12-05 08:05:40
-    Sat,Sun 08:05:40 → Sat,Sun *-*-* 08:05:40
-    2003-03-05 05:40 → 2003-03-05 05:40:00
-    2003-03-05 → 2003-03-05 00:00:00
-         03-05 → *-03-05 00:00:00
-        hourly → *-*-* *:00:00
-         daily → *-*-* 00:00:00
-       monthly → *-*-01 00:00:00
-        weekly → Mon *-*-* 00:00:00
-        yearly → *-01-01 00:00:00
-      annually → *-01-01 00:00:00
-         *:2/3 → *-*-* *:02/3:00</programlisting>
+          Sat,Sun 08:05:40 → Sat,Sun *-*-* 08:05:40
+          2003-03-05 05:40 → 2003-03-05 05:40:00
+      2003-03-05 05:40 UTC → 2003-03-05 05:40:00 UTC
+                2003-03-05 → 2003-03-05 00:00:00
+                     03-05 → *-03-05 00:00:00
+                    hourly → *-*-* *:00:00
+                     daily → *-*-* 00:00:00
+                 daily UTC → *-*-* 00:00:00 UTC
+                   monthly → *-*-01 00:00:00
+                    weekly → Mon *-*-* 00:00:00
+                    yearly → *-01-01 00:00:00
+                  annually → *-01-01 00:00:00
+                     *:2/3 → *-*-* *:02/3:00</programlisting>
 
       <para>Calendar events are used by timer units, see
       <citerefentry><refentrytitle>systemd.timer</refentrytitle><manvolnum>5</manvolnum></citerefentry>
diff --git a/src/basic/calendarspec.c b/src/basic/calendarspec.c
index 2dcc9c5575..a2296f4709 100644
--- a/src/basic/calendarspec.c
+++ b/src/basic/calendarspec.c
@@ -279,6 +279,9 @@ int calendar_spec_to_string(const CalendarSpec *c, char **p) {
         fputc(':', f);
         format_chain(f, 2, c->second);
 
+        if (c->utc)
+                fputs(" UTC", f);
+
         r = fflush_and_check(f);
         if (r < 0) {
                 free(buf);
@@ -657,6 +660,10 @@ int calendar_spec_from_string(const char *p, CalendarSpec **spec) {
         if (!c)
                 return -ENOMEM;
 
+        c->utc = endswith_no_case(p, "UTC");
+        if (c->utc)
+                p = strndupa(p, strlen(p) - strlen(" UTC"));
+
         if (strcaseeq(p, "minutely")) {
                 r = const_chain(0, &c->second);
                 if (r < 0)
@@ -859,13 +866,13 @@ static int find_matching_component(const CalendarComponent *c, int *val) {
         return r;
 }
 
-static bool tm_out_of_bounds(const struct tm *tm) {
+static bool tm_out_of_bounds(const struct tm *tm, bool utc) {
         struct tm t;
         assert(tm);
 
         t = *tm;
 
-        if (mktime(&t) == (time_t) -1)
+        if (mktime_or_timegm(&t, utc) == (time_t) -1)
                 return true;
 
         /* Did any normalization take place? If so, it was out of bounds before */
@@ -878,7 +885,7 @@ static bool tm_out_of_bounds(const struct tm *tm) {
                 t.tm_sec != tm->tm_sec;
 }
 
-static bool matches_weekday(int weekdays_bits, const struct tm *tm) {
+static bool matches_weekday(int weekdays_bits, const struct tm *tm, bool utc) {
         struct tm t;
         int k;
 
@@ -886,7 +893,7 @@ static bool matches_weekday(int weekdays_bits, const struct tm *tm) {
                 return true;
 
         t = *tm;
-        if (mktime(&t) == (time_t) -1)
+        if (mktime_or_timegm(&t, utc) == (time_t) -1)
                 return false;
 
         k = t.tm_wday == 0 ? 6 : t.tm_wday - 1;
@@ -904,7 +911,7 @@ static int find_next(const CalendarSpec *spec, struct tm *tm) {
 
         for (;;) {
                 /* Normalize the current date */
-                mktime(&c);
+                mktime_or_timegm(&c, spec->utc);
                 c.tm_isdst = -1;
 
                 c.tm_year += 1900;
@@ -916,7 +923,7 @@ static int find_next(const CalendarSpec *spec, struct tm *tm) {
                         c.tm_mday = 1;
                         c.tm_hour = c.tm_min = c.tm_sec = 0;
                 }
-                if (r < 0 || tm_out_of_bounds(&c))
+                if (r < 0 || tm_out_of_bounds(&c, spec->utc))
                         return r;
 
                 c.tm_mon += 1;
@@ -927,7 +934,7 @@ static int find_next(const CalendarSpec *spec, struct tm *tm) {
                         c.tm_mday = 1;
                         c.tm_hour = c.tm_min = c.tm_sec = 0;
                 }
-                if (r < 0 || tm_out_of_bounds(&c)) {
+                if (r < 0 || tm_out_of_bounds(&c, spec->utc)) {
                         c.tm_year ++;
                         c.tm_mon = 0;
                         c.tm_mday = 1;
@@ -938,14 +945,14 @@ static int find_next(const CalendarSpec *spec, struct tm *tm) {
                 r = find_matching_component(spec->day, &c.tm_mday);
                 if (r > 0)
                         c.tm_hour = c.tm_min = c.tm_sec = 0;
-                if (r < 0 || tm_out_of_bounds(&c)) {
+                if (r < 0 || tm_out_of_bounds(&c, spec->utc)) {
                         c.tm_mon ++;
                         c.tm_mday = 1;
                         c.tm_hour = c.tm_min = c.tm_sec = 0;
                         continue;
                 }
 
-                if (!matches_weekday(spec->weekdays_bits, &c)) {
+                if (!matches_weekday(spec->weekdays_bits, &c, spec->utc)) {
                         c.tm_mday++;
                         c.tm_hour = c.tm_min = c.tm_sec = 0;
                         continue;
@@ -954,7 +961,7 @@ static int find_next(const CalendarSpec *spec, struct tm *tm) {
                 r = find_matching_component(spec->hour, &c.tm_hour);
                 if (r > 0)
                         c.tm_min = c.tm_sec = 0;
-                if (r < 0 || tm_out_of_bounds(&c)) {
+                if (r < 0 || tm_out_of_bounds(&c, spec->utc)) {
                         c.tm_mday ++;
                         c.tm_hour = c.tm_min = c.tm_sec = 0;
                         continue;
@@ -963,14 +970,14 @@ static int find_next(const CalendarSpec *spec, struct tm *tm) {
                 r = find_matching_component(spec->minute, &c.tm_min);
                 if (r > 0)
                         c.tm_sec = 0;
-                if (r < 0 || tm_out_of_bounds(&c)) {
+                if (r < 0 || tm_out_of_bounds(&c, spec->utc)) {
                         c.tm_hour ++;
                         c.tm_min = c.tm_sec = 0;
                         continue;
                 }
 
                 r = find_matching_component(spec->second, &c.tm_sec);
-                if (r < 0 || tm_out_of_bounds(&c)) {
+                if (r < 0 || tm_out_of_bounds(&c, spec->utc)) {
                         c.tm_min ++;
                         c.tm_sec = 0;
                         continue;
@@ -991,13 +998,13 @@ int calendar_spec_next_usec(const CalendarSpec *spec, usec_t usec, usec_t *next)
         assert(next);
 
         t = (time_t) (usec / USEC_PER_SEC) + 1;
-        assert_se(localtime_r(&t, &tm));
+        assert_se(localtime_or_gmtime_r(&t, &tm, spec->utc));
 
         r = find_next(spec, &tm);
         if (r < 0)
                 return r;
 
-        t = mktime(&tm);
+        t = mktime_or_timegm(&tm, spec->utc);
         if (t == (time_t) -1)
                 return -EINVAL;
 
diff --git a/src/basic/calendarspec.h b/src/basic/calendarspec.h
index 7baf318249..56dc02f391 100644
--- a/src/basic/calendarspec.h
+++ b/src/basic/calendarspec.h
@@ -36,6 +36,7 @@ typedef struct CalendarComponent {
 
 typedef struct CalendarSpec {
         int weekdays_bits;
+        bool utc;
 
         CalendarComponent *year;
         CalendarComponent *month;
diff --git a/src/basic/time-util.c b/src/basic/time-util.c
index 531931f6e1..d4e0914b27 100644
--- a/src/basic/time-util.c
+++ b/src/basic/time-util.c
@@ -19,7 +19,6 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
-#include <time.h>
 #include <string.h>
 #include <sys/timex.h>
 #include <sys/timerfd.h>
@@ -205,11 +204,8 @@ static char *format_timestamp_internal(char *buf, size_t l, usec_t t, bool utc)
                 return NULL;
 
         sec = (time_t) (t / USEC_PER_SEC);
+        localtime_or_gmtime_r(&sec, &tm, utc);
 
-        if (utc)
-                gmtime_r(&sec, &tm);
-        else
-                localtime_r(&sec, &tm);
         if (strftime(buf, l, "%a %Y-%m-%d %H:%M:%S %Z", &tm) <= 0)
                 return NULL;
 
@@ -235,10 +231,7 @@ static char *format_timestamp_internal_us(char *buf, size_t l, usec_t t, bool ut
                 return NULL;
 
         sec = (time_t) (t / USEC_PER_SEC);
-        if (utc)
-                gmtime_r(&sec, &tm);
-        else
-                localtime_r(&sec, &tm);
+        localtime_or_gmtime_r(&sec, &tm, utc);
 
         if (strftime(buf, l, "%a %Y-%m-%d %H:%M:%S", &tm) <= 0)
                 return NULL;
@@ -484,9 +477,10 @@ int parse_timestamp(const char *t, usec_t *usec) {
         };
 
         const char *k;
+        bool utc;
         struct tm tm, copy;
         time_t x;
-        usec_t plus = 0, minus = 0, ret;
+        usec_t x_usec, plus = 0, minus = 0, ret;
         int r, weekday = -1;
         unsigned i;
 
@@ -511,28 +505,15 @@ int parse_timestamp(const char *t, usec_t *usec) {
         assert(t);
         assert(usec);
 
-        x = time(NULL);
-        assert_se(localtime_r(&x, &tm));
-        tm.tm_isdst = -1;
-
-        if (streq(t, "now"))
-                goto finish;
-
-        else if (streq(t, "today")) {
-                tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
-                goto finish;
+        if (t[0] == '@')
+                return parse_sec(t + 1, usec);
 
-        } else if (streq(t, "yesterday")) {
-                tm.tm_mday --;
-                tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
-                goto finish;
+        ret = now(CLOCK_REALTIME);
 
-        } else if (streq(t, "tomorrow")) {
-                tm.tm_mday ++;
-                tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
+        if (streq(t, "now"))
                 goto finish;
 
-        } else if (t[0] == '+') {
+        else if (t[0] == '+') {
                 r = parse_sec(t+1, &plus);
                 if (r < 0)
                         return r;
@@ -546,35 +527,51 @@ int parse_timestamp(const char *t, usec_t *usec) {
 
                 goto finish;
 
-        } else if (t[0] == '@')
-                return parse_sec(t + 1, usec);
-
-        else if (endswith(t, " ago")) {
-                _cleanup_free_ char *z;
-
-                z = strndup(t, strlen(t) - 4);
-                if (!z)
-                        return -ENOMEM;
+        } else if (endswith(t, " ago")) {
+                t = strndupa(t, strlen(t) - strlen(" ago"));
 
-                r = parse_sec(z, &minus);
+                r = parse_sec(t, &minus);
                 if (r < 0)
                         return r;
 
                 goto finish;
-        } else if (endswith(t, " left")) {
-                _cleanup_free_ char *z;
 
-                z = strndup(t, strlen(t) - 4);
-                if (!z)
-                        return -ENOMEM;
+        } else if (endswith(t, " left")) {
+                t = strndupa(t, strlen(t) - strlen(" left"));
 
-                r = parse_sec(z, &plus);
+                r = parse_sec(t, &plus);
                 if (r < 0)
                         return r;
 
                 goto finish;
         }
 
+        utc = endswith_no_case(t, " UTC");
+        if (utc)
+                t = strndupa(t, strlen(t) - strlen(" UTC"));
+
+        x = ret / USEC_PER_SEC;
+        x_usec = 0;
+
+        assert_se(localtime_or_gmtime_r(&x, &tm, utc));
+        tm.tm_isdst = -1;
+
+        if (streq(t, "today")) {
+                tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
+                goto from_tm;
+
+        } else if (streq(t, "yesterday")) {
+                tm.tm_mday --;
+                tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
+                goto from_tm;
+
+        } else if (streq(t, "tomorrow")) {
+                tm.tm_mday ++;
+                tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
+                goto from_tm;
+        }
+
+
         for (i = 0; i < ELEMENTSOF(day_nr); i++) {
                 size_t skip;
 
@@ -592,66 +589,106 @@ int parse_timestamp(const char *t, usec_t *usec) {
 
         copy = tm;
         k = strptime(t, "%y-%m-%d %H:%M:%S", &tm);
-        if (k && *k == 0)
-                goto finish;
+        if (k) {
+                if (*k == '.')
+                        goto parse_usec;
+                else if (*k == 0)
+                        goto from_tm;
+        }
 
         tm = copy;
         k = strptime(t, "%Y-%m-%d %H:%M:%S", &tm);
-        if (k && *k == 0)
-                goto finish;
+        if (k) {
+                if (*k == '.')
+                        goto parse_usec;
+                else if (*k == 0)
+                        goto from_tm;
+        }
 
         tm = copy;
         k = strptime(t, "%y-%m-%d %H:%M", &tm);
         if (k && *k == 0) {
                 tm.tm_sec = 0;
-                goto finish;
+                goto from_tm;
         }
 
         tm = copy;
         k = strptime(t, "%Y-%m-%d %H:%M", &tm);
         if (k && *k == 0) {
                 tm.tm_sec = 0;
-                goto finish;
+                goto from_tm;
         }
 
         tm = copy;
         k = strptime(t, "%y-%m-%d", &tm);
         if (k && *k == 0) {
                 tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
-                goto finish;
+                goto from_tm;
         }
 
         tm = copy;
         k = strptime(t, "%Y-%m-%d", &tm);
         if (k && *k == 0) {
                 tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
-                goto finish;
+                goto from_tm;
         }
 
         tm = copy;
         k = strptime(t, "%H:%M:%S", &tm);
-        if (k && *k == 0)
-                goto finish;
+        if (k) {
+                if (*k == '.')
+                        goto parse_usec;
+                else if (*k == 0)
+                        goto from_tm;
+        }
 
         tm = copy;
         k = strptime(t, "%H:%M", &tm);
         if (k && *k == 0) {
                 tm.tm_sec = 0;
-                goto finish;
+                goto from_tm;
         }
 
         return -EINVAL;
 
-finish:
-        x = mktime(&tm);
+parse_usec:
+        {
+                char *end;
+                unsigned long long val;
+                size_t l;
+
+                k++;
+                if (*k < '0' || *k > '9')
+                        return -EINVAL;
+
+                /* base 10 instead of base 0, .09 is not base 8 */
+                errno = 0;
+                val = strtoull(k, &end, 10);
+                if (*end || errno)
+                        return -EINVAL;
+
+                l = end-k;
+
+                /* val has l digits, make them 6 */
+                for (; l < 6; l++)
+                        val *= 10;
+                for (; l > 6; l--)
+                        val /= 10;
+
+                x_usec = val;
+        }
+
+from_tm:
+        x = mktime_or_timegm(&tm, utc);
         if (x == (time_t) -1)
                 return -EINVAL;
 
         if (weekday >= 0 && tm.tm_wday != weekday)
                 return -EINVAL;
 
-        ret = (usec_t) x * USEC_PER_SEC;
+        ret = (usec_t) x * USEC_PER_SEC + x_usec;
 
+finish:
         ret += plus;
         if (ret > minus)
                 ret -= minus;
@@ -1072,3 +1109,11 @@ int get_timezone(char **tz) {
         *tz = z;
         return 0;
 }
+
+time_t mktime_or_timegm(struct tm *tm, bool utc) {
+        return utc ? timegm(tm) : mktime(tm);
+}
+
+struct tm *localtime_or_gmtime_r(const time_t *t, struct tm *tm, bool utc) {
+        return utc ? gmtime_r(t, tm) : localtime_r(t, tm);
+}
diff --git a/src/basic/time-util.h b/src/basic/time-util.h
index 1af01541fc..417376ea96 100644
--- a/src/basic/time-util.h
+++ b/src/basic/time-util.h
@@ -21,8 +21,9 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
-#include <stdio.h>
 #include <inttypes.h>
+#include <stdio.h>
+#include <time.h>
 
 typedef uint64_t usec_t;
 typedef uint64_t nsec_t;
@@ -117,3 +118,6 @@ clockid_t clock_boottime_or_monotonic(void);
                           "xstrftime: " #buf "[] must be big enough")
 
 int get_timezone(char **timezone);
+
+time_t mktime_or_timegm(struct tm *tm, bool utc);
+struct tm *localtime_or_gmtime_r(const time_t *t, struct tm *tm, bool utc);
diff --git a/src/test/test-calendarspec.c b/src/test/test-calendarspec.c
index 87e1da1258..ad36ef19b0 100644
--- a/src/test/test-calendarspec.c
+++ b/src/test/test-calendarspec.c
@@ -50,6 +50,44 @@ static void test_one(const char *input, const char *output) {
         assert_se(streq(q, p));
 }
 
+static void test_next(const char *input, const char *new_tz, usec_t after, usec_t expect) {
+        CalendarSpec *c;
+        usec_t u;
+        char *old_tz;
+        char buf[FORMAT_TIMESTAMP_MAX];
+        int r;
+
+        old_tz = getenv("TZ");
+        if (old_tz)
+                old_tz = strdupa(old_tz);
+
+        if (new_tz)
+                assert_se(setenv("TZ", new_tz, 1) >= 0);
+        else
+                assert_se(unsetenv("TZ") >= 0);
+        tzset();
+
+        assert_se(calendar_spec_from_string(input, &c) >= 0);
+
+        printf("\"%s\"\n", input);
+
+        u = after;
+        r = calendar_spec_next_usec(c, after, &u);
+        printf("At: %s\n", r < 0 ? strerror(-r) : format_timestamp(buf, sizeof(buf), u));
+        if (expect != (usec_t)-1)
+                assert_se(r >= 0 && u == expect);
+        else
+                assert(r == -ENOENT);
+
+        calendar_spec_free(c);
+
+        if (old_tz)
+                assert_se(setenv("TZ", old_tz, 1) >= 0);
+        else
+                assert_se(unsetenv("TZ") >= 0);
+        tzset();
+}
+
 int main(int argc, char* argv[]) {
         CalendarSpec *c;
 
@@ -82,6 +120,15 @@ int main(int argc, char* argv[]) {
         test_one("semi-annually", "*-01,07-01 00:00:00");
         test_one("annually", "*-01-01 00:00:00");
         test_one("*:2/3", "*-*-* *:02/3:00");
+        test_one("2015-10-25 01:00:00 uTc", "2015-10-25 01:00:00 UTC");
+
+        test_next("2016-03-27 03:17:00", "", 12345, 1459048620000000);
+        test_next("2016-03-27 03:17:00", "CET", 12345, 1459041420000000);
+        test_next("2016-03-27 03:17:00", "EET", 12345, -1);
+        test_next("2016-03-27 03:17:00 UTC", NULL, 12345, 1459048620000000);
+        test_next("2016-03-27 03:17:00 UTC", "", 12345, 1459048620000000);
+        test_next("2016-03-27 03:17:00 UTC", "CET", 12345, 1459048620000000);
+        test_next("2016-03-27 03:17:00 UTC", "EET", 12345, 1459048620000000);
 
         assert_se(calendar_spec_from_string("test", &c) < 0);
         assert_se(calendar_spec_from_string("", &c) < 0);
diff --git a/src/test/test-date.c b/src/test/test-date.c
index 00b569080c..bd1b2781df 100644
--- a/src/test/test-date.c
+++ b/src/test/test-date.c
@@ -23,12 +23,12 @@
 
 #include "util.h"
 
-static void test_one(const char *p) {
+static void test_should_pass(const char *p) {
         usec_t t, q;
         char buf[FORMAT_TIMESTAMP_MAX], buf_relative[FORMAT_TIMESTAMP_RELATIVE_MAX];
 
         assert_se(parse_timestamp(p, &t) >= 0);
-        format_timestamp(buf, sizeof(buf), t);
+        format_timestamp_us(buf, sizeof(buf), t);
         log_info("%s", buf);
 
         /* Chop off timezone */
@@ -42,23 +42,50 @@ static void test_one(const char *p) {
         assert_se(parse_timestamp(buf, &q) >= 0);
 }
 
+static void test_should_fail(const char *p) {
+        usec_t t;
+
+        assert_se(parse_timestamp(p, &t) < 0);
+}
+
+static void test_one(const char *p) {
+        _cleanup_free_ char *with_utc;
+
+        log_info("Test: %s", p);
+        with_utc = strjoin(p, " UTC", NULL);
+        test_should_pass(p);
+        test_should_pass(with_utc);
+}
+
+static void test_one_noutc(const char *p) {
+        _cleanup_free_ char *with_utc;
+
+        log_info("Test: %s", p);
+        with_utc = strjoin(p, " UTC", NULL);
+        test_should_pass(p);
+        test_should_fail(with_utc);
+}
+
 int main(int argc, char *argv[]) {
         test_one("17:41");
         test_one("18:42:44");
+        test_one("18:42:44.0");
+        test_one("18:42:44.999999999999");
         test_one("12-10-02 12:13:14");
         test_one("12-10-2 12:13:14");
         test_one("12-10-03 12:13");
         test_one("2012-12-30 18:42");
         test_one("2012-10-02");
         test_one("Tue 2012-10-02");
-        test_one("now");
+        test_one_noutc("now");
         test_one("yesterday");
         test_one("today");
         test_one("tomorrow");
-        test_one("+2d");
-        test_one("+2y 4d");
-        test_one("5months ago");
-        test_one("@1395716396");
+        test_one_noutc("+2d");
+        test_one_noutc("+2y 4d");
+        test_one_noutc("5months ago");
+        test_one_noutc("@1395716396");
+        test_one_noutc("today UTC");
 
         return 0;
 }