]>
Commit | Line | Data |
---|---|---|
1 | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">\r | |
2 | <html lang="en">\r | |
3 | <head>\r | |
4 | <meta http-equiv="Content-Type" content="text/html; charset=utf-8">\r | |
5 | <meta http-equiv="Content-Style-Type" content="text/css">\r | |
6 | <link rel="up" title="FatFs" href="../00index_e.html">\r | |
7 | <link rel="alternate" hreflang="ja" title="Japanese" href="../ja/fattime.html">\r | |
8 | <link rel="stylesheet" href="../css_e.css" type="text/css" media="screen" title="ELM Default">\r | |
9 | <title>FatFs - get_fattime</title>\r | |
10 | </head>\r | |
11 | \r | |
12 | <body>\r | |
13 | \r | |
14 | <div class="para func">\r | |
15 | <h2>get_fattime</h2>\r | |
16 | <p>The get_fattime function is called to get the current time.</p>\r | |
17 | <pre>\r | |
18 | DWORD get_fattime (void);\r | |
19 | </pre>\r | |
20 | </div>\r | |
21 | \r | |
22 | \r | |
23 | <div class="para ret">\r | |
24 | <h4>Return Value</h4>\r | |
25 | <p>Currnet local time shall be returned as bit-fields packed into a <tt>DWORD</tt> value. The bit fields are as follows:</p>\r | |
26 | <dl class="ret">\r | |
27 | <dt>bit31:25</dt>\r | |
28 | <dd>Year origin from the 1980 (0..127, e.g. 37 for 2017)</dd>\r | |
29 | <dt>bit24:21</dt>\r | |
30 | <dd>Month (1..12)</dd>\r | |
31 | <dt>bit20:16</dt>\r | |
32 | <dd>Day of the month (1..31)</dd>\r | |
33 | <dt>bit15:11</dt>\r | |
34 | <dd>Hour (0..23)</dd>\r | |
35 | <dt>bit10:5</dt>\r | |
36 | <dd>Minute (0..59)</dd>\r | |
37 | <dt>bit4:0</dt>\r | |
38 | <dd>Second / 2 (0..29, e.g. 25 for 50)</dd>\r | |
39 | </dl>\r | |
40 | </div>\r | |
41 | \r | |
42 | \r | |
43 | <div class="para desc">\r | |
44 | <h4>Description</h4>\r | |
45 | <p>The <tt>get_fattime</tt> function shall return any valid time even if the system does not support a real time clock. If a zero is returned, the file will not have a valid timestamp.</p>\r | |
46 | </div>\r | |
47 | \r | |
48 | \r | |
49 | <div class="para comp">\r | |
50 | <h4>QuickInfo</h4>\r | |
51 | <p>This function is not needed when <tt><a href="config.html#fs_readonly">FF_FS_READONLY</a> == 1</tt> or <tt><a href="config.html#fs_nortc">FF_FS_NORTC</a> == 1</tt>.</p>\r | |
52 | </div>\r | |
53 | \r | |
54 | \r | |
55 | <div class="para use">\r | |
56 | <h4>Example</h4>\r | |
57 | <pre>\r | |
58 | DWORD get_fattime (void)\r | |
59 | {\r | |
60 | time_t t;\r | |
61 | struct tm *stm;\r | |
62 | \r | |
63 | \r | |
64 | t = time(0);\r | |
65 | stm = localtime(&t);\r | |
66 | \r | |
67 | return (DWORD)(stm->tm_year - 80) << 25 |\r | |
68 | (DWORD)(stm->tm_mon + 1) << 21 |\r | |
69 | (DWORD)stm->tm_mday << 16 |\r | |
70 | (DWORD)stm->tm_hour << 11 |\r | |
71 | (DWORD)stm->tm_min << 5 |\r | |
72 | (DWORD)stm->tm_sec >> 1;\r | |
73 | }\r | |
74 | </pre>\r | |
75 | </div>\r | |
76 | \r | |
77 | \r | |
78 | <p class="foot"><a href="../00index_e.html">Return</a></p>\r | |
79 | </body>\r | |
80 | </html>\r |