縮寫 全稱1st first 2nd second 3rd third 4th fourth5th fifth 6th sixth 7th seventh 8th eighth9th ninth 10th tenth11th eleventh 12th twelfth 13th thirteenth14th fourteenth 15th fifteenth 16th sixteenth17th seventeenth 18th eighteenth 19th nineteenth20th twentieth21st twenty first 22nd twenty second23nd twenty third24th tewnty fouth25th twenty fifth26th twenty sixth27th twenty seventh28th twenty eighth29th twenty ninth30th thirtieth 31st hirty first-------------------------月份縮寫為全稱的前三個字母：January JanFebruary FebMarch MarApril AprMay MayJune JunJuly JulAugust AugSeptember SepOctober OctNovember NovDecember Dec