Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| President | Vice | Romanized (Hangul) | Took office | Left office | Political party |
| --- | --- | --- | --- | --- | --- |
| Syngman Rhee | 1.0 | Yi Si-yeong (이시영) | 24 July 1948 | 9 May 1951 (Resign) | Korea Democratic Party |
| Syngman Rhee | 2.0 | Kim Seong-su (김성수) | 17 May 1951 | 29 May 1952 (Resign) | Korea Democratic Party |
| Syngman Rhee | 3.0 | Hahm Tae-young (함태영) | 15 June 1952 | 14 August 1956 | Independent |
| Syngman Rhee | 4.0 | Chang Myon (장면) | 15 August 1956 | 23 April 1960 (Resign) | Democratic Party |
| Syngman Rhee | 5.0 | Yun Bo-seon (윤보선) | 23 April 1960 | 26 April 1960 | Democratic Party |
| Yun Bo-seon | 6.0 | Heo Jeong (윤보선) | 13 August 1960 | 16 August 1960 | Democratic Party |
| Yun Bo-seon | 7.0 | Song Yo-chan (송요찬) | 16 August 1960 | 19 August 1960 | Military |
Question:
When did chang myon (장면) leave office?
Answer:
23 April 1960 (Resign)