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C # tutorial
This section, we introduce the Perl language for the date and time of processing.
Perl is a function of the processing time are the following:
Let's looklocaltime () function, which returns the current date and time at no parameters.
The following nine symbols representing different date and time parameters:
sec, # 秒, 0 到 61 min, # 分钟, 0 到 59 hour, # 小时, 0 到 24 mday, # 天, 1 到 31 mon, # 月, 0 到 11 year, # 年,从 1900 开始 wday, # 星期几,0-6,0表示周日 yday, # 一年中的第几天,0-364,365 isdst # 如果夏令时有效,则为真
Examples of presentation as follows:
#!/usr/bin/perl @months = qw( 一月 二月 三月 四月 五月 六月 七月 八月 九月 十月 十一月 十二月 ); @days = qw(星期天 星期一 星期二 星期三 星期四 星期五 星期六); ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime(); print "$mday $months[$mon] $days[$wday]\n";
Examples of the implementation of the above output is:
12 六月 星期天
If the direct call to localtime (), which returns the current system time zone settings, the examples are as follows:
#!/usr/bin/perl $datestring = localtime(); print "时间日期为:$datestring\n";
Examples of the implementation of the above output is:
时间日期为:Sun Jun 12 11:27:31 2016
Functiongmtime () and localtime () is similar, but it returns the standard Greenwich Mean Time.
#!/usr/bin/perl $local_datestring = localtime(); print "本地时间日期为:$local_datestring\n"; $gmt_datestring = gmtime(); print "GMT 时间日期为:$gmt_datestring\n";
Examples of the implementation of the above output is:
本地时间日期为:Sun Jun 12 11:32:14 2016 GMT 时间日期为:Sun Jun 12 03:32:14 2016
We can see from the example, China and the GMT time difference of 8 hours.
We can use localtime () 9 time function element to the output format of the time required to develop. Formatted output using the printf () function:
#!/usr/bin/perl ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime(); printf("格式化时间:HH:MM:SS\n"); printf("%02d:%02d:%02d", $hour, $min, $sec);
Examples of the implementation of the above output is:
格式化时间:HH:MM:SS 11:35:23
We can use the time () function to obtain a new era of time, the function returns from January 1, 1970 Cumulative number of seconds. Examples are as follows:
#!/usr/bin/perl $epoc = time(); print "从1970年1月1日起累计的秒数为:$epoc\n";
Examples of the implementation of the above output is:
从1970年1月1日起累计的秒数为:1465702883
We can output a time format we want:
#!/usr/bin/perl ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime(); print "当期时间和日期:"; printf("%d-%d-%d %d:%d:%d",$year+1990,$mon+1,$mday,$hour,$min,$sec); print "\n"; $epoc = time(); $epoc = $epoc - 24 * 60 * 60; # 一天前的时间秒数 ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime($epoc); print "昨天时间和日期:"; printf("%d-%d-%d %d:%d:%d",$year+1990,$mon+1,$mday,$hour,$min,$sec); print "\n";
Examples of the implementation of the above output is:
当期时间和日期:2106-6-12 11:49:28 昨天时间和日期:2106-6-11 11:49:28
Function strftime () can be formatted as time format we want.
The following table lists some of the formatting symbols, asterisk indicates you want to rely on local time:
symbol | description | Examples |
---|---|---|
%a | Week abbreviation (Sun/enSat) * | Thu |
%A | Week full name (Sunday/enSaturday) * | Thursday |
%b | Month abbreviation (Jan/enDec) * | Aug |
%B | The full name of the month (January/enDecember) * | August |
%c | Date and Time * | Thu Aug 23 14:55:02 2001 |
%C | In addition to the year 100, and rounding ( 00-99 ) | 20 |
%d | Day of the month ( 01-31 ) | 23 |
%D | Date, MM/DD/YY equivalent to %m/%d/%y | 08/23/01 |
%e | The first few days of the month, padded with spaces digits ( 1-31 ) | 23 |
%F | YYYY-MM-DD shorthand similar to %Y-%m-%d | 2001-08-23 |
%g | The last two digits of the year ( 00-99 ) | 01 |
%g | year | 2001 |
%h | * Short months (and %b option) | Aug |
%H | 24-hour clock ( 00-23 ) | 14 |
%I | 12-hour clock ( 01-12 ) | 02 |
%j | The first few days of the year ( 001-366 ) | 235 |
%m | Month ( 01-12 ) | 08 |
%M | Min ( 00-59 ) | 55 |
%n | Newline ( '\n' ) | |
%p | Show AM or PM | PM |
%r | Time (hh: mm: ss AM or PM), 12 hours * | 02:55:02 pm |
%R | 24 hours HH:MM time format, equal to %H:%M | 14:55 |
%S | Seconds ( 00-61 ) | 02 |
%t | Horizontal tab ( '\t' ) | |
%T | Time (24-hour clock) (hh: mm: ss) , equal to %H:%M:%S | 14:55 |
%u | ISO 8601 format of the week, Monday is 1 ( 1-7 ) | 4 |
%U | The first few weeks of the year, Sunday is the first day ( 00-53 ) | 33 |
%V | ISO 8601 week number ( 00-53 ) | 34 |
%w | The first few days (0 for Sunday) a week ( 0-6 ) | 4 |
%W | The first few weeks of the year, Monday is the first day ( 00-53 ) | 34 |
%x | Format to display the date (mm / dd / yy) * | 08/23/01 |
%X | Display Time format * | 14:55:02 |
%y | , The two-digit ( 00-99 ) | 01 |
%Y | year | 2001 |
%z | ISO 8601 time zone offset from UTC (1 minute = 1, 1 hour = 100) | +100 |
%Z | Name of the current time zone, such as "China Standard Time" * | CDT |
%% | % Symbol | % |
Examples are as follows:
#!/usr/bin/perl use POSIX qw(strftime); $datestring = strftime "%Y-%m-%d %H:%M:%S", localtime; printf("时间日期 - $datestring\n"); # GMT 格式化时间日期 $datestring = strftime "%Y-%m-%d %H:%M:%S", gmtime; printf("时间日期 - $datestring\n");
Examples of the implementation of the above output is:
时间日期 - 2016-06-12 12:15:13 时间日期 - 2016-06-12 04:15:13