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-rw-r--r--docs/ref/templates/builtins.txt3
1 files changed, 2 insertions, 1 deletions
diff --git a/docs/ref/templates/builtins.txt b/docs/ref/templates/builtins.txt
index f4e49a9f52..e06d28db33 100644
--- a/docs/ref/templates/builtins.txt
+++ b/docs/ref/templates/builtins.txt
@@ -506,7 +506,8 @@ Available format strings:
month, 2 characters.
t Number of days in the given month. ``28`` to ``31``
T Time zone of this machine. ``'EST'``, ``'MDT'``
- U Not implemented.
+ U Seconds since the Unix Epoch
+ (January 1 1970 00:00:00 UTC).
w Day of the week, digits without ``'0'`` (Sunday) to ``'6'`` (Saturday)
leading zeros.
W ISO-8601 week number of year, with ``1``, ``53``