55 lines
1.7 KiB
Plaintext
55 lines
1.7 KiB
Plaintext
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This rule raises an issue when a date format string has the 24-hour code with the AM/PM marker or the 12-hour code without the AM/PM marker.
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== Why is this an issue?
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The `%p` directive in the `strftime` method is used to represent the AM/PM marker in a time string. It is commonly used in conjunction with the `%I` directive, which represents the hour in a 12-hour clock.
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Using the 24-hour format directive with an AM/PM marker can lead to unwanted results e.g.:
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[source,python]
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----
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time_string = time(16,0).strftime("%H:%M %p")
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print(time_string)
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----
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will print `16:00 PM` which makes no sense.
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On the other hand the AM/PM marker is needed when the 12-hour format directive is used to show complete information about an hour e.g.:
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[source,python]
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----
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time_string = time(16,0).strftime("%I:%M")
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print(time_string)
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----
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will print 04:00 without indicating if the time is in the morning or the afternoon.
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== How to fix it
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Use either the 12-hour time format with an AM/PM marker or the 24-hour format without.
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=== Code examples
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==== Noncompliant code example
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[source,python,diff-id=1,diff-type=noncompliant]
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----
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from datetime import time
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def foo():
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t = time(16, 0)
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formatted_time1 = t.strftime("%H:%M %p") # Noncompliant: 16:00 PM
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formatted_time2 = t.strftime("%I:%M") # Noncompliant: 04:00
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----
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==== Compliant solution
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[source,python,diff-id=1,diff-type=compliant]
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----
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from datetime import time
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def foo():
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t = time(16, 0)
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formatted_time1 = t.strftime("%I:%M %p") # OK: 04:00 PM
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formatted_time2 = t.strftime("%H:%M") # OK: 16:00
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----
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== Resources
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=== Documentation
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* Python documentation - https://docs.python.org/3/library/datetime.html#strftime-and-strptime-format-codes[strftime() and strptime() Format Codes]
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