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Top Forums UNIX for Beginners Questions & Answers How to calculate time duration in Linux? Post 303035412 by Neo on Thursday 23rd of May 2019 07:16:57 AM
Old 05-23-2019
It is always best to always get in the habit of converting time text string (formatted time) to a unix timestamp (a number).

Then, format the timestamp(s) math results as needed.

It's always best in programming to separate the time functions and processing of time from the formatting of strings, because it is trivial to convert strings to timestamps and timestamps to formatted strings.

FYI, Just about every date stored in our database here at unix.com is a unix timestamp. We generally don't store formatted date strings in DB tables (unless of course the date is part of some text in a post).
 

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utc(1m) 																   utc(1m)

NAME
utc - A dcecp object that manipulates UTC timestamps SYNOPSIS
utc add timestamp relative_timestamp utc compare absolute_timestamp absolute_timestamp [-noinaccuracy] utc convert absolute_timestamp [-gmt] utc help [operation | -verbose] utc multiply relative_timestamp {integer | floating_point_factor} utc operations utc subtract timestamp timestamp ARGUMENTS
An International Organization for Standardization (ISO) compliant time format of the following form: CCYY-MMDD- hh:mm:ss.fff[+|-]hh:mmIsss.fff The Time Differential Factor (TDF) component [+|-]hh.mm, if present, indicates the offset from Universal Time Coordinated (UTC) time and implies local system time. The inaccuracy component Iss.fff, if present, specifies the duration of the time interval that contains the absolute time. A floating-point number such as 53.234. A whole number such as 79. The name of the utc operation for which to display help information. A Distributed Time Service (DTS) timestamp of the following form: [-]DD-hh:mm:ss.fff- Iss.fff Relative times often omit fractions of seconds (the leftmost .fff sequence) and generally lack an inaccuracy component (Iss.fff). For example, a relative time of 21 days, 8 hours, and 15 minutes is expressed as 21-08:15:00. A utc timestamp that can be a relative or absolute time. See the relative_timestamp and absolute_timestamp argument descriptions for the format of these timestamps. DESCRIPTION
The utc object lets you add, compare, and convert timestamps in DTS and ISO formats. OPERATIONS
utc add Adds two timestamps. The syntax is as follows: utc add timestamp relative_timestamp The add operation returns the sum of two timestamps. The timestamps can be two relative times or an absolute time and a relative time. Privileges Required No special privileges are needed to use the utc add command. Examples dcecp> utc add 1994-10-18-13:21:50.419-04:00I----- +0-00:02:00.000I----- 1994-10-18-13:23:50.419-04:00I----- dcecp> utc compare Compares two absolute timestamps indicating the temporal order. The syntax is as follows: utc compare absolute_timestamp absolute_time- stamp [-noinaccuracy] The compare operation compares two timestamps and returns -1 if the first is earlier, 1 if the second is earlier, and 0 if the difference is indeterminate. Specify the -noinaccuracy option to ignore inaccuracies in comparisons; in this case a return of 0 indicates the times are the same. Privileges Required No special privileges are needed to use the utc compare command. Examples dcecp> utc compare 1994-10-18-13:22:32.816-04:00I----- > 1994-10-18-13:21:50.419-04:00I----- -noinaccuracy 1 dcecp> utc convert Converts a timestamp from UTC to local time. The syntax is as follows: utc convert absolute_timestamp [-gmt] The convert operation accepts a timestamp and returns another timestamp that expresses the same time in the local time zone. If called with the -gmt option it returns a Greenwich mean time (GMT) formatted timestamp. Privileges Required No special privileges are needed to use the utc convert command. Examples dcecp> utc convert 1994-10-18-13:22:32.816-00:00I----- 1994-10-18-09:22:32.816-04:00I----- dcecp> dcecp> utc convert 1994-10-18-13:22:32.816-00:00I----- -gmt 1994-10-18-13:22:32.816I----- dcecp> utc help Returns help information about the utc object and its operations. The syntax is as follows: utc help [operation | -verbose] Options Displays information about the utc object. Used without an argument or option, the utc help command returns brief information about each utc operation. The optional operation argu- ment is the name of an operation about which you want detailed information. Alternatively, you can use the -verbose option for more detailed information about the utc object itself. Privileges Required No special privileges are needed to use the utc help command. Examples dcecp> utc help add Adds a relative and absolute, or two relative, timestamps. compare Compares two timestamps to determine which is earlier. convert Converts a timestamp into the local timezone or GMT. multiply Multiplies a relative timestamp by a number. subtract Returns the difference between two timestamps. help Prints a summary of command-line options. operations Returns a list of the valid operations for this command. dcecp> utc multiply Multiplies a relative time (a length of time) by an integer or floating-point factor. The syntax is as follows: utc multiply rela- tive_timestamp {integer | floating_point_factor} The multiply operation accepts two arguments: a relative timestamp and an integer or floating-point factor. It multiplies the length of time (specified by the relative timestamp) by the integer or floating-point factor, returning the product as a relative timestamp. Privileges Required No special privileges are needed to use the utc multiply command. Examples dcecp> utc multiply +0-00:00:05.000I----- 3 +0-00:00:15.000I----- dcecp> utc operations Returns a list of the operations supported by the utc object. The syntax is as follows: utc operations The list of available operations is in alphabetical order except for help and operations, which are listed last. Privileges Required No special privileges are needed to use the utc operations command. Examples dcecp> utc operations add compare convert multiply subtract help operations dcecp> utc subtract Subtracts one timestamp from another, returning the difference as a relative timestamp. The syntax is as follows: utc subtract timestamp timestamp The subtract operation returns the difference between two timestamps that express either an absolute time and a relative time, two relative times, or two absolute times. Subtracting an absolute timestamp from a relative timestamp, however, is not allowed. The return value is an absolute or relative timestamp, depending on how the command is used. Privileges Required No special privileges are needed to use the utc subtract command. Examples dcecp> utc subtract 1994-10-18-13:22:32.816-00:00I----- +0-00:00:15.000I----- 1994-10-18-13:22:17.816+00:00I----- dcecp> RELATED INFORMATION
Commands: dcecp(1m), dcecp_clock(1m), dcecp_dts(1m), dtsd(1m). utc(1m)
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