{"id":555,"date":"2017-07-09T14:41:03","date_gmt":"2017-07-09T06:41:03","guid":{"rendered":"https:\/\/9dream.me\/?p=555"},"modified":"2017-07-09T14:42:31","modified_gmt":"2017-07-09T06:42:31","slug":"python%e5%9f%ba%e7%a1%807-2-datetime","status":"publish","type":"post","link":"https:\/\/9dream.me\/python%e5%9f%ba%e7%a1%807-2-datetime\/","title":{"rendered":"Python\u57fa\u78407.2-datetime"},"content":{"rendered":"
datetime\u662fPython\u5904\u7406\u65e5\u671f\u548c\u65f6\u95f4\u7684\u6807\u51c6\u5e93\u3002<\/p>\n
\u6211\u4eec\u5148\u770b\u5982\u4f55\u83b7\u53d6\u5f53\u524d\u65e5\u671f\u548c\u65f6\u95f4\uff1a<\/p>\n
>>> from datetime import datetime\r\n>>> now = datetime.now() # \u83b7\u53d6\u5f53\u524ddatetime<\/span>\r\n>>> print<\/span>(now)\r\n2015<\/span>-05<\/span>-18<\/span> 16<\/span>:28<\/span>:07.198690<\/span>\r\n>>> print<\/span>(type(now))\r\n<class<\/span> 'datetime<\/span>.datetime<\/span>'>\r\n<\/span><\/code><\/pre>\n\u6ce8\u610f\u5230datetime<\/code>\u662f\u6a21\u5757\uff0cdatetime<\/code>\u6a21\u5757\u8fd8\u5305\u542b\u4e00\u4e2adatetime<\/code>\u7c7b\uff0c\u901a\u8fc7from datetime import datetime<\/code>\u5bfc\u5165\u7684\u624d\u662fdatetime<\/code>\u8fd9\u4e2a\u7c7b\u3002<\/p>\n\u5982\u679c\u4ec5\u5bfc\u5165import datetime<\/code>\uff0c\u5219\u5fc5\u987b\u5f15\u7528\u5168\u540ddatetime.datetime<\/code>\u3002<\/p>\ndatetime.now()<\/code>\u8fd4\u56de\u5f53\u524d\u65e5\u671f\u548c\u65f6\u95f4\uff0c\u5176\u7c7b\u578b\u662fdatetime<\/code>\u3002<\/p>\n\u83b7\u53d6\u6307\u5b9a\u65e5\u671f\u548c\u65f6\u95f4<\/h3>\n
\u8981\u6307\u5b9a\u67d0\u4e2a\u65e5\u671f\u548c\u65f6\u95f4\uff0c\u6211\u4eec\u76f4\u63a5\u7528\u53c2\u6570\u6784\u9020\u4e00\u4e2adatetime<\/code>\uff1a<\/p>\n>>> <\/span>from<\/span> datetime import<\/span> datetime\r\n>>> <\/span>dt = datetime(2015<\/span>, 4<\/span>, 19<\/span>, 12<\/span>, 20<\/span>) # \u7528\u6307\u5b9a\u65e5\u671f\u65f6\u95f4\u521b\u5efadatetime<\/span>\r\n>>> <\/span>print(dt)\r\n2015<\/span>-04<\/span>-19<\/span> 12<\/span>:20<\/span>:00<\/span>\r\n<\/code><\/pre>\ndatetime\u8f6c\u6362\u4e3atimestamp<\/h3>\n
\u5728\u8ba1\u7b97\u673a\u4e2d\uff0c\u65f6\u95f4\u5b9e\u9645\u4e0a\u662f\u7528\u6570\u5b57\u8868\u793a\u7684\u3002\u6211\u4eec\u628a1970\u5e741\u67081\u65e5 00:00:00 UTC+00:00\u65f6\u533a\u7684\u65f6\u523b\u79f0\u4e3aepoch time\uff0c\u8bb0\u4e3a0<\/code>\uff081970\u5e74\u4ee5\u524d\u7684\u65f6\u95f4timestamp\u4e3a\u8d1f\u6570\uff09\uff0c\u5f53\u524d\u65f6\u95f4\u5c31\u662f\u76f8\u5bf9\u4e8eepoch time\u7684\u79d2\u6570\uff0c\u79f0\u4e3atimestamp\u3002<\/p>\n\u4f60\u53ef\u4ee5\u8ba4\u4e3a\uff1a<\/p>\n
timestamp = 0<\/span> = 1970<\/span>-1<\/span>-1<\/span> 00<\/span>:00<\/span>:00<\/span> UTC+0<\/span>:00<\/span><\/span><\/span>\r\n<\/code><\/pre>\n\u5bf9\u5e94\u7684\u5317\u4eac\u65f6\u95f4\u662f\uff1a<\/p>\n
timestamp = 0<\/span> = 1970<\/span>-1<\/span>-1<\/span> 08<\/span>:00<\/span>:00<\/span> UTC+8<\/span>:00<\/span><\/span><\/span>\r\n<\/code><\/pre>\n\u53ef\u89c1timestamp\u7684\u503c\u4e0e\u65f6\u533a\u6beb\u65e0\u5173\u7cfb\uff0c\u56e0\u4e3atimestamp\u4e00\u65e6\u786e\u5b9a\uff0c\u5176UTC\u65f6\u95f4\u5c31\u786e\u5b9a\u4e86\uff0c\u8f6c\u6362\u5230\u4efb\u610f\u65f6\u533a\u7684\u65f6\u95f4\u4e5f\u662f\u5b8c\u5168\u786e\u5b9a\u7684\uff0c\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u8ba1\u7b97\u673a\u5b58\u50a8\u7684\u5f53\u524d\u65f6\u95f4\u662f\u4ee5timestamp\u8868\u793a\u7684\uff0c\u56e0\u4e3a\u5168\u7403\u5404\u5730\u7684\u8ba1\u7b97\u673a\u5728\u4efb\u610f\u65f6\u523b\u7684timestamp\u90fd\u662f\u5b8c\u5168\u76f8\u540c\u7684\uff08\u5047\u5b9a\u65f6\u95f4\u5df2\u6821\u51c6\uff09\u3002<\/p>\n
\u628a\u4e00\u4e2adatetime<\/code>\u7c7b\u578b\u8f6c\u6362\u4e3atimestamp\u53ea\u9700\u8981\u7b80\u5355\u8c03\u7528timestamp()<\/code>\u65b9\u6cd5\uff1a<\/p>\n>>> <\/span>from<\/span> datetime import<\/span> datetime\r\n>>> <\/span>dt = datetime(2015<\/span>, 4<\/span>, 19<\/span>, 12<\/span>, 20<\/span>) # \u7528\u6307\u5b9a\u65e5\u671f\u65f6\u95f4\u521b\u5efadatetime<\/span>\r\n>>> <\/span>dt.timestamp() # \u628adatetime\u8f6c\u6362\u4e3atimestamp<\/span>\r\n1429417200.0<\/span>\r\n<\/code><\/pre>\n\u6ce8\u610fPython\u7684timestamp\u662f\u4e00\u4e2a\u6d6e\u70b9\u6570\u3002\u5982\u679c\u6709\u5c0f\u6570\u4f4d\uff0c\u5c0f\u6570\u4f4d\u8868\u793a\u6beb\u79d2\u6570\u3002<\/p>\n
\u67d0\u4e9b\u7f16\u7a0b\u8bed\u8a00\uff08\u5982Java\u548cJavaScript\uff09\u7684timestamp\u4f7f\u7528\u6574\u6570\u8868\u793a\u6beb\u79d2\u6570\uff0c\u8fd9\u79cd\u60c5\u51b5\u4e0b\u53ea\u9700\u8981\u628atimestamp\u9664\u4ee51000\u5c31\u5f97\u5230Python\u7684\u6d6e\u70b9\u8868\u793a\u65b9\u6cd5\u3002<\/p>\n
timestamp\u8f6c\u6362\u4e3adatetime<\/h3>\n
\u8981\u628atimestamp\u8f6c\u6362\u4e3adatetime<\/code>\uff0c\u4f7f\u7528datetime<\/code>\u63d0\u4f9b\u7684fromtimestamp()<\/code>\u65b9\u6cd5\uff1a<\/p>\n>>> <\/span>from<\/span> datetime import<\/span> datetime\r\n>>> <\/span>t = 1429417200.0<\/span>\r\n>>> <\/span>print(datetime.fromtimestamp(t))\r\n2015<\/span>-04<\/span>-19<\/span> 12<\/span>:20<\/span>:00<\/span>\r\n<\/code><\/pre>\n\u6ce8\u610f\u5230timestamp\u662f\u4e00\u4e2a\u6d6e\u70b9\u6570\uff0c\u5b83\u6ca1\u6709\u65f6\u533a\u7684\u6982\u5ff5\uff0c\u800cdatetime\u662f\u6709\u65f6\u533a\u7684\u3002\u4e0a\u8ff0\u8f6c\u6362\u662f\u5728timestamp\u548c\u672c\u5730\u65f6\u95f4\u505a\u8f6c\u6362\u3002<\/p>\n
\u672c\u5730\u65f6\u95f4\u662f\u6307\u5f53\u524d\u64cd\u4f5c\u7cfb\u7edf\u8bbe\u5b9a\u7684\u65f6\u533a\u3002\u4f8b\u5982\u5317\u4eac\u65f6\u533a\u662f\u4e1c8\u533a\uff0c\u5219\u672c\u5730\u65f6\u95f4\uff1a<\/p>\n
2015-04-19 12:20<\/span>:00<\/span>\r\n<\/code><\/pre>\n\u5b9e\u9645\u4e0a\u5c31\u662fUTC+8:00\u65f6\u533a\u7684\u65f6\u95f4\uff1a<\/p>\n
2015-04-19 12:20<\/span>:00<\/span> UTC<\/span>+8:00<\/span>\r\n<\/code><\/pre>\n\u800c\u6b64\u523b\u7684\u683c\u6797\u5a01\u6cbb\u6807\u51c6\u65f6\u95f4\u4e0e\u5317\u4eac\u65f6\u95f4\u5dee\u4e868\u5c0f\u65f6\uff0c\u4e5f\u5c31\u662fUTC+0:00\u65f6\u533a\u7684\u65f6\u95f4\u5e94\u8be5\u662f\uff1a<\/p>\n
2015-04-19 04:20<\/span>:00<\/span> UTC<\/span>+0:00<\/span>\r\n<\/code><\/pre>\ntimestamp\u4e5f\u53ef\u4ee5\u76f4\u63a5\u88ab\u8f6c\u6362\u5230UTC\u6807\u51c6\u65f6\u533a\u7684\u65f6\u95f4\uff1a<\/p>\n
>>> <\/span>from<\/span> datetime import<\/span> datetime\r\n>>> <\/span>t = 1429417200.0<\/span>\r\n>>> <\/span>print(datetime.fromtimestamp(t)) # \u672c\u5730\u65f6\u95f4<\/span>\r\n2015<\/span>-04<\/span>-19<\/span> 12<\/span>:20<\/span>:00<\/span>\r\n>>> <\/span>print(datetime.utcfromtimestamp(t)) # UTC\u65f6\u95f4<\/span>\r\n2015<\/span>-04<\/span>-19<\/span> 04<\/span>:20<\/span>:00<\/span>\r\n<\/code><\/pre>\nstr\u8f6c\u6362\u4e3adatetime<\/h3>\n
\u5f88\u591a\u65f6\u5019\uff0c\u7528\u6237\u8f93\u5165\u7684\u65e5\u671f\u548c\u65f6\u95f4\u662f\u5b57\u7b26\u4e32\uff0c\u8981\u5904\u7406\u65e5\u671f\u548c\u65f6\u95f4\uff0c\u9996\u5148\u5fc5\u987b\u628astr\u8f6c\u6362\u4e3adatetime\u3002\u8f6c\u6362\u65b9\u6cd5\u662f\u901a\u8fc7datetime.strptime()<\/code>\u5b9e\u73b0\uff0c\u9700\u8981\u4e00\u4e2a\u65e5\u671f\u548c\u65f6\u95f4\u7684\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\uff1a<\/p>\n>>> <\/span>from<\/span> datetime import<\/span> datetime\r\n>>> <\/span>cday = datetime.strptime('2015-6-1 18:19:59'<\/span>, '%Y-%m-%d %H:%M:%S'<\/span>)\r\n>>> <\/span>print(cday)\r\n2015<\/span>-06<\/span>-01<\/span> 18<\/span>:19<\/span>:59<\/span>\r\n<\/code><\/pre>\n