Get detailed description of the current date () function

Date (string format, int timestamp)

This function returns the string generated by the timestamp parameter in the specified format. The timestamp parameter is optional. If it is omitted, the current time is used. The format parameter allows developers to output time and date in the specified format.

Date_default_timezone_set (PRC); // Set Beijing time.

1. Year-month-day

Echo date ('Y-m-J'); // example: 2007-02-6

Echo date ('Y-n-J'); // example: 07-2-6

Uppercase y indicates four digits of the year, while lowercase y indicates two digits of the year;

Lowercase M indicates the number of the month (with the leading digit), while lowercase n indicates the number of the month without the leading digit.

Echo date ('Y-m-J'); // example: 2007-feb-6

Echo date ('Y-m-d'); // example: 2007-02-06

Uppercase M indicates the three abbreviations of the month, while lowercase M indicates the number of the month (with leading 0 );

There is no upper-case J. only lower-case J indicates the date of the month, and there is no leading O. If the month needs to have the upper-case J, the lower-case D is used.

Echo date ('Y-m-J'); // example: 2007-feb-6

Echo date ('Y-F-js'); // example: 2007-February-6

Uppercase M indicates the three abbreviated characters of the month, while uppercase F indicates the full English Writing of the month. (No lower case F)

Uppercase s indicates the suffix of a date, such as "St", "nd", "RD", and "th". For details, see the date number.

Summary:

Y indicates that the year can be in uppercase or lowercase y;

Indicates that the month can be written in uppercase letters (F), uppercase letters (M), lowercase letters (M), and lowercase letters (n );

Indicates the date suffix.

2, hour: minute: Second

By default, PHP interprets the display time as "Greenwich Mean Time", which is 8 hours different from our local time.

Echo date ('G: I: s A'); // example: 5: 56: 57 AM

Echo date ('H: I: s A'); // example: 05: 56: 57 AM

Lowercase G indicates the 12-hour system, with no leading 0, while lowercase h indicates the 12-hour system with leading 0.

When the 12-hour format is used, it indicates that upper afternoon, lower case A indicates lower case "am" and "PM", and upper case A indicates upper case "am" and "PM ".

Echo date ('G: I: s'); 14:02:26

Uppercase G indicates the number of hours in the 24-hour format, but does not contain the leading value. uppercase h indicates the number of hours in the 24-hour format.

Summary:

The letter G indicates that the hour does not contain a leading character, and the letter h indicates that the hour contains a leading character;

Lowercase G and H are in 12-hour format, while uppercase G and H are in 24-hour format.

3, leap year, week, day

Capital L indicates whether to determine the leap year Of The Year. If it is true, 1 is returned; otherwise, 0 is returned;

Lowercase L indicates the day of the week in full (Tuesday );

However, uppercase D is used to represent the three abbreviation of the day of the week (Tue ).

Echo date ('W'); // example: Today's week: 2

Echo date ('W'); // For example, this week is the 06th week of the year.

Lowercase W indicates the day of the week, expressed in numbers

In upper case, W indicates the number of weeks in a year.

Echo date ('T'); // example: this month is 28 days

Echo date ('Z'); // example: Today is the 36th day of this year

Lowercase t indicates the number of days in the current month

Lowercase Z indicates that today is the day of the year

4. Others

Echo date ('T'); // example: UTC

Uppercase t indicates the time zone setting of the server

Echo date ('I'); // example: 0

If I is used to determine whether the current value is success, 1 is returned for true. Otherwise, 0 is returned.

Echo date ('U'); // example: 1170769424

The upper-case u table shows the total number of seconds from January 1, January 1, 1970 to the present, which is the Unix timestamp of the UNIX time era.

Echo date ('C'); // example: 2007-02-06t14: 24: 43 + 00: 00

Lowercase c Represents the iso8601 date, the date format is YYYY-MM-DD, with the letter T to interval the date and time, the time format is hh: mm: SS, the time zone uses Greenwich Mean Time (GMT).

Echo date ('R'); // example: Tue, 06 Feb 2007 14:25:52 + 0000

Lowercase R indicates the rfc822 date.