# number of seconds since 1970

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### Why the programming language and database are to be calculated starting from January 1, 1970

I was watching today.Python APIwhen, see TimeModule:The epoch is the point where the time starts. On January 1st of this year, at 0 hours,the "time since the epoch" is zero. For Unix, the epoch is 1970. To the "What's The epoch is", look at Gmtime (0

### Mktime (the numberofseconds after the time structure data is converted)

Mktime(Converts the time structure data to the following number of seconds)Header file# Include Define functionsTime_tMktime(Strcut TM * timeptr );Function DescriptionMktime() Is used to convert the TM structure data referred to by the timeptr

### Converts the numberofsecondssince January 1, January 1, 1970

#include using namespace std;bool IsRound(int year){ if((year%100)&&(year%4==0)) return 1; if((year%100==0)&&(year%400==0)) return 1; return 0;}int main() { int n; int year_s[2]= {365*24*60*60, 366*24*60*60}; int month_s[2][12]={{31,28,31,30,31,30,31

### Java.sql.date and Java.util.date differences and time of day and seconds when inserting bands in a database

Java.sql.date,java.sql.time and Java.sql.Timestamp Three are subclasses of Java.util.Date (wrapper class). Java.sql.Date is a subclass of Java.util.Date, a thin wrapper that wraps a millisecond value, allowing JDBC to identify the millisecond value

### PHP Time Function collation

Here are some of the time functions in PHP:(1) DateUsage: Date (format, [time]);If there is no time parameter, the current time is used. The format is a string, where the following characters have special meanings:U is replaced by the number of

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### PHP Time Function collation

Here are some of the time functions in PHP:(1) DateUsage: Date (format, [time]);If there is no time parameter, the current time is used. The format is a string in which the following characters have special meanings:U is replaced by the number of

### PHP Time function

Here are some of the time functions in PHP:(1) DateUsage: Date (format, [time]);If there is no time parameter, the current time is used. The format is a string in which the following characters have special meanings:U is replaced by the number of

### VC ++ obtains the system time and program running time (precise to seconds and milliseconds ).

VC ++ obtains the system time and program running time (precise to seconds and milliseconds ). 1. Use the CTime class (get the current system time, accurate to seconds)CString str; // obtain the system time CTime tm; tm = CTime: GetCurrentTime (); //

### NSDate only gets the implementation of the date and year--that is, as long as the month and day, do not spare hours minutes ofseconds

(Only personal, if there is a difference, or not high efficiency also please point out, thank you)Recently in writing a back word app, according to Ebbinghaus curve to review the enhanced memory, need to calculate two review of the difference of

### Time module of [Python]

The time module provides a variety of functions and ways to identify the timing value, there are two main formats for identifying time: one is identified as a timestamp, which is the number of seconds from January 1, 1970 0:0, 0 seconds to the

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