1 files changed, 17 insertions, 9 deletions

diff --git a/include/usage.h b/include/usage.h
index 450f80164..e7e9002f9 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -558,22 +558,30 @@
        "world\n"
 
 #define date_trivial_usage \
-       "[OPTION]... [MMDDhhmm[[CC]YY][.ss]] [+FORMAT]"
+       "[OPTION]... [+FMT] [TIME]"
 #define date_full_usage \
-       "Display current time in the given FORMAT, or set system date\n" \
+       "Display time (using +FMT), or set time\n" \
      "\nOptions:" \
+     "\n        -u              Work in UTC (don't convert to local time)" \
      "\n        -R              Output RFC-822 compliant date string" \
-     "\n        -d STRING       Display time described by STRING, not 'now'" \
         USE_FEATURE_DATE_ISOFMT( \
-     "\n        -I[TIMESPEC]    Output an ISO-8601 compliant date/time string" \
-     "\n                        TIMESPEC='date' (or missing) for date only," \
+     "\n        -I[SPEC]        Output ISO-8601 compliant date string" \
+     "\n                        SPEC='date' (default) for date only," \
      "\n                        'hours', 'minutes', or 'seconds' for date and" \
      "\n                        time to the indicated precision" \
-     "\n        -D hint         Use 'hint' as date format, via strptime()" \
         ) \
-     "\n        -s STRING       Set time described by STRING" \
-     "\n        -r FILE         Display the last modification time of FILE" \
-     "\n        -u              Print or sets Coordinated Universal Time" \
+     "\n        -d TIME         Display TIME, not 'now'" \
+     "\n        -r FILE         Display last modification time of FILE" \
+     "\n        [-s] TIME       Set time to TIME" \
+        USE_FEATURE_DATE_ISOFMT( \
+     "\n        -D FMT          Use FMT for str->date conversion" \
+        ) \
+     "\n" \
+     "\nRecognized formats for TIME:" \
+     "\n        [hh:]mm:ss" \
+     "\n        mon.day-hh:mm[:ss]" \
+     "\n        year.mon.day-hh:mm[:ss]" \
+     "\n        MMDDhhmm[[YY]YY][.ss]" \
 
 #define date_example_usage \
        "$ date\n" \