A timestamp refers to the total number of seconds from 00:00:00 UTC on January 1, 1970 (08:00:00 Beijing time, January 1, 1970) to the current time.

A timestamp is data generated using digital signature technology. The signed objects include the original file information, signature parameters, signature time, and other details. The timestamp system is used to generate and manage timestamps, providing digital signatures to signed objects to prove that the original file existed before the signature time.

A trusted timestamp is an electronic certificate issued by a Joint Trusted Timestamp Service Center, used to prove that the content of an electronic data file remains intact and unmodified since it was applied for a trusted timestamp. The issuance of a trusted timestamp approval certificate marks the beginning of the standardized application of trusted timestamps in the archiving field, which will play a key role in preventing tampering with electronic archives and digital copies, ensuring the legal validity of archived documents. According to the "Electronic Signature Law," electronic files, electronic archives, or digitized copies of paper archives with trusted timestamp certification are considered original documents as specified by regulations.

Get Timestamp Code:

Swift	NSDate().timeIntervalSince1970
Go	import ( "time" ) int32(time.Now().Unix())
Java	// pure java (int) (System.currentTimeMillis() / 1000) // joda (int) (DateTime.now().getMillis() / 1000)
JavaScript	Math.round(new Date() / 1000)
Objective-C	[[NSDate date] timeIntervalSince1970]
MySQL	SELECT unix_timestamp(now())
SQLite	SELECT strftime('%s', 'now')
Erlang	calendar:datetime_to_gregorian_seconds(calendar:universal_time())-719528*24*3600.
PHP	// pure php time() // Carbon\Carbon Carbon::now()->timestamp
Python	import time time.time()
Ruby	Time.now.to_i
Shell	date +%s
Groovy	(new Date().time / 1000).intValue()
Lua	os.time()
.NET/C#	(DateTime.Now.ToUniversalTime().Ticks - 621355968000000000) / 10000000