diff --git a/doc/man/timew.1.in b/doc/man/timew.1.in
index 87699028..2513e1ec 100644
--- a/doc/man/timew.1.in
+++ b/doc/man/timew.1.in
@@ -396,6 +396,86 @@ Range hints provide convenient shortcuts to date ranges:
   :lastquarter   Last quarter
   :lastyear      Last year
 
+.SH DATES
+Timewarrior supports the following date formats based on ISO-8601:
+
+  <extended-date> [T <extended-time>]   Extended date, optional extended time
+  <date> [T <time>]                     Date, optional time
+  <extended-time>                       Extended time
+  <time>                                Time
+
+  extended-date:
+    YYYY-MM-DD                          Year, month, day
+    YYYY-MM                             Year, month, 1st
+    YYYY-DDD                            Year, Julian day 001-366
+    YYYY-WwwD                           Year, week number, day number
+    YYYY-Www                            Year, week number, day 1
+
+  extended-time:
+    hh:mm[:ss]Z                         Hours, minutes, optional seconds, UTC
+    hh:mm[:ss][+/-hh:mm]                Hours, minutes, optional seconds, TZ
+
+  date:
+    YYYYMMDD                            Year, month, day
+    YYYYWww                             Year, week number, day number
+    YYYYDDD                             Year, Julian day 001-366
+
+  time:
+    hhmm[ss]Z                           Hour, minutes, optional seconds, UTC
+    hhmm[ss][+/-hh[mm]]                 Hour, minutes, optional seconds, TZ
+
+Examples:
+  2016-06-09T08:12:00Z
+  2016-06T08:12:00+01:00
+  2016-06T08:12Z
+  2016-161
+  2016-W244
+  2016-W24
+  20160609T081200Z
+  2016W24
+  8:12:00Z
+  0812-0500
+
+In addition to the standard date formats, the following are supported:
+
+  now                                   Current date and time
+  today                                 Current date at 0:00:00
+  sod, eod                              Current date at 0:00:00 and 23:59:59
+  yesterday                             Yesterday at 0:00:00
+  tomorrow                              Tomorrow at 0:00:00 (midnight tonight)
+  <day-of-week>                         Previous named day at 0:00:00
+  <month-of-year>                       Previous 1st of the  month at 0:00:00
+  Nst, Nnd, Nrd, Nth                    Previous 1st, 2nd, 3rd ...
+  later                                 2038-01-18T0:00:00 (Y2K38)
+  someday                               2038-01-18T0:00:00 (Y2K38)
+  soy, eoy                              Previous start/end of year
+  socy, eocy                            Start/end of current year
+  soq, eoq                              Previous start/end of quarter
+  socq, eocq                            Start/end of current quarter
+  som, eom                              Previous start/end of month
+  socm, eocm                            Start/end of current month
+  sow, eow                              Previous start/end of week
+  socw, eocw                            Start/end of current week
+  soww, eoww                            Start/end of current work week (mon - fri)
+  easter                                Easter Sunday
+  eastermonday                          Easter Monday
+  ascension                             Ascension
+  pentecost                             Pentecost
+  goodfriday                            Good Friday
+  midsommar                             midnight, 1st Saturday after 20th June
+  midsommarafton                        midnight, 1st Friday after 19th June
+  juhannus                              midnight, 1st Friday after 19th June
+  hh:mm[:ss][am|a|pm|p]                 Short time format
+  <epoch>                               POSIX time
+
+Examples:
+  8am
+  24th
+  monday
+  august
+
+See also 'duration', 'hints'.
+
 
 .SH CONFIGURATION FILE AND OVERRIDE OPTIONS
 Timewarrior stores its configuration in a file in the user's home directory: