Hi, Arthur.

In the section of 'date->string' in SRFI-19, it says:

    ~I	hour, zero padded, 12-hour clock (01...12)
    ...
    ~l	hour, blank padded, 12-hour clock ( 1...12)

~I and ~l formatter should print from 1 to 12 (This aligns with how we
read time from real clock and watch).

However, the sample implementation of ~I and ~l would print 00 or 0 for
time at 00:XX.

xxxxxx@(guile-user)> (define d (make-date 0 0 0 0 1 9 2018 0))
xxxxxx@(guile-user)> (date->string d)
$1 = "Sat Sep 01 00:00:00Z 2018"
xxxxxx@(guile-user)> (date->string d "~I")
$2 = "00"
--
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Zihao / 閱卜錄