1. linux c的时间操作的函数关系图如下:
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2. strftime时间格式化的说明如下:
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| %a | Abbreviated weekday name * | Thu |
| %A | Full weekday name * | Thursday |
| %b | Abbreviated month name * | Aug |
| %B | Full month name * | August |
| %c | Date and time representation * | Thu Aug 23 14:55:02 2001 |
| %d | Day of the month (01-31) | 23 |
| %H | Hour in 24h format (00-23) | 14 |
| %I | Hour in 12h format (01-12) | 02 |
| %j | Day of the year (001-366) | 235 |
| %m | Month as a decimal number (01-12) | 08 |
| %M | Minute (00-59) | 55 |
| %p | AM or PM designation | PM |
| %S | Second (00-61) | 02 |
| %U | Week number with the first Sunday as the first day of week one (00-53) | 33 |
| %w | Weekday as a decimal number with Sunday as?0?(0-6) | 4 |
| %W | Week number with the first Monday as the first day of week one (00-53) | 34 |
| %x | Date representation * | 08/23/01 |
| %X | Time representation * | 14:55:02 |
| %y | Year, last two digits (00-99) | 01 |
| %Y | Year | 2001 |
| %Z | Timezone name or abbreviation | CDT |
| %% | A?%?sign | % |
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原文：http://jimmee.iteye.com/blog/2165681