The People's Republic of China was established (on) 1 October, 1949.
注意in与on的使用:on表示“在物体的表面上”,而in表示“在其中”。指能用in的表达方式有in the morning,in the afternoon,in the evening和in the night。只能用on的表达方式有onthe next morning,onthe following afternoon,onthe preceding evening,onthe night before,onthe morning of 6 January等。英美两国人在用in与on的习惯上不同。表示“在报上,地图上”等时,介词用in,而不用on。表示“手,脚受伤”时,应用介词in,而表示“手脚上的斑点”时,应用介词on;
He lives on the next street.(美国用法) He lives in the next street.(英国用法)