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Formats date to a string based on the requested format.

format string can be composed of the following elements:

• 'yyyy': 4 digit representation of year (e.g. AD 1 => 0001, AD 2010 => 2010)
• 'yy': 2 digit representation of year, padded (00-99). (e.g. AD 2001 => 01, AD 2010 => 10)
• 'y': 1 digit representation of year, e.g. (AD 1 => 1, AD 199 => 199)
• 'MMMM': Month in year (January-December)
• 'MMM': Month in year (Jan-Dec)
• 'MM': Month in year, padded (01-12)
• 'M': Month in year (1-12)
• 'dd': Day in month, padded (01-31)
• 'd': Day in month (1-31)
• 'EEEE': Day in Week,(Sunday-Saturday)
• 'EEE': Day in Week, (Sun-Sat)
• 'HH': Hour in day, padded (00-23)
• 'H': Hour in day (0-23)
• 'hh': Hour in AM/PM, padded (01-12)
• 'h': Hour in AM/PM, (1-12)
• 'mm': Minute in hour, padded (00-59)
• 'm': Minute in hour (0-59)
• 'ss': Second in minute, padded (00-59)
• 's': Second in minute (0-59)
• 'sss': Millisecond in second, padded (000-999)
• 'a': AM/PM marker
• 'Z': 4 digit (+sign) representation of the timezone offset (-1200-+1200)
• 'ww': Week of year, padded (00-53). Week 01 is the week with the first Thursday of the year
• 'w': Week of year (0-53). Week 1 is the week with the first Thursday of the year
• 'G', 'GG', 'GGG': The abbreviated form of the era string (e.g. 'AD')

• 'GGGG': The long form of the era string (e.g. 'Anno Domini')

  format string can also be one of the following predefined localizable formats:

• 'medium': equivalent to 'MMM d, y h:mm:ss a' for en_US locale (e.g. Sep 3, 2010 12:05:08 PM)

• 'short': equivalent to 'M/d/yy h:mm a' for en_US locale (e.g. 9/3/10 12:05 PM)
• 'fullDate': equivalent to 'EEEE, MMMM d, y' for en_US locale (e.g. Friday, September 3, 2010)
• 'longDate': equivalent to 'MMMM d, y' for en_US locale (e.g. September 3, 2010)
• 'mediumDate': equivalent to 'MMM d, y' for en_US locale (e.g. Sep 3, 2010)
• 'shortDate': equivalent to 'M/d/yy' for en_US locale (e.g. 9/3/10)
• 'mediumTime': equivalent to 'h:mm:ss a' for en_US locale (e.g. 12:05:08 PM)

• 'shortTime': equivalent to 'h:mm a' for en_US locale (e.g. 12:05 PM)

  format string can contain literal values. These need to be escaped by surrounding with single quotes (e.g. "h 'in the morning'"). In order to output a single quote, escape it - i.e., two single quotes in a sequence (e.g. "h 'o''clock'").