常用的时间格式化

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Format Description Example
"y" 1 digit min year 1, 42, 2017
"yy" 2 digit year 01, 42, 17
"yyy" 3 digit min year 001, 042, 2017
"yyyy" 4 digit min year 0001, 0042, 2017
"M" 1 digit min month 7, 12
"MM" 2 digit month 07, 12
"MMM" 3 letter month abbr. Jul, Dec
"MMMM" Full month July, December
"MMMMM" 1 letter month abbr. J, D
"d" 1 digit min day 4, 25
"dd" 2 digit day 04, 25
"E", "EE", "EEE" 3 letter day name abbr. Wed, Thu
"EEEE" full day name Wednesday, Thursday
"EEEEE" 1 letter day name abbr. W, T
"EEEEEE" 2 letter day name abbr. We, Th
"a" Period of day AM, PM
"h" AM/PM 1 digit min hour 5, 7
"hh" AM/PM 2 digit hour 05, 07
"H" 24 hr 1 digit min hour 17, 7
"HH" 24 hr 2 digit hour 17, 07
"m" 1 digit min minute 1, 40
"mm" 2 digit minute 01, 40
"s" 1 digit min second 1, 40
"ss" 2 digit second 01, 40
"S" 10th's place of fractional second 123ms -> 1, 7ms -> 0
"SS" 10th's & 100th's place of fractional second 123ms -> 12, 7ms -> 00
"SSS" 10th's & 100th's & 1,000's place of fractional second 123ms -> 123, 7ms -> 007