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a - "am" or "pm"
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A - "AM" or "PM"
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B - Swatch Internet time
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d - day of the month, 2 digits with leading zeros; i.e. "01" to "31"
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D - day of the week, textual, 3 letters; i.e. "Fri"
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F - month, textual, long; i.e. "January"
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g - hour, 12-hour format without leading zeros; i.e. "1" to "12"
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G - hour, 24-hour format without leading zeros; i.e. "0" to "23"
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h - hour, 12-hour format; i.e. "01" to "12"
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H - hour, 24-hour format; i.e. "00" to "23"
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i - minutes; i.e. "00" to "59"
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I (capital i) - "1" if Daylight Savings Time, "0" otherwise.
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j - day of the month without leading zeros; i.e. "1" to "31"
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l (lowercase 'L') - day of the week, textual, long; i.e. "Friday"
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L - boolean for whether it is a leap year; i.e. "0" or "1"
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m - month; i.e. "01" to "12"
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M - month, textual, 3 letters; i.e. "Jan"
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n - month without leading zeros; i.e. "1" to "12"
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s - seconds; i.e. "00" to "59"
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S - English ordinal suffix, textual, 2 characters; i.e. "th", "nd"
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t - number of days in the given month; i.e. "28" to "31"
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T - Timezone setting of this machine; i.e. "MDT"
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U - seconds since the epoch
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w - day of the week, numeric, i.e. "0" (Sunday) to "6" (Saturday)
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Y - year, 4 digits; i.e. "1999"
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y - year, 2 digits; i.e. "99"
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z - day of the year; i.e. "0" to "365"
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Z - timezone offset in seconds (i.e. "-43200" to "43200")