weekday as a one-digit decimal number (1–7 (Monday - Sunday)) (for
example, Sunday=7).
%U
week number of the year as a decimal number (0–53). Sunday is
considered the first day of the week.
Note
To add a leading zero before a single-digit number, insert a 0
before the directive (for example, %0U).
%V
week number (01–53) with the first Monday as the start day of the first
week. Minimum days of the first week is 4.
Note
To add a leading zero before a single-digit number, insert a 0
before the directive (for example, %0SV).
%w
weekday as a one-digit decimal number (0–6 (Sunday through Saturday))
(for example, Sunday=0).
Note
To add a leading ...
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