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;doc: improve --value-at docs
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Simon Michael
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@ -487,11 +487,11 @@ A note for Ledger users: Ledger's -V also infers market prices from journal entr
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but we don't do that. hledger's -V uses only market prices declared explicitly, with P directives.
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(Mnemonic: -B/--cost uses transaction prices, -V/--value uses market prices.)
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### Value at another date
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### Valuation date
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*(experimental, added 201904)*
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You can select other valuation dates with the `--value-at` option. (This implies `-V`):
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You can select valuation dates other than today, with the `--value-at` option. (This implies `-V`):
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--value-at=VALUEDATE as of which date should market values be calculated ?
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transaction|period|now|YYYY-MM-DD (default: now)
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@ -500,20 +500,24 @@ The argument must be one of the keywords shown, or their first letter, or a cust
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The precise effect of the keywords is command-specific, but here is their general meaning:
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`--value-at=transaction` (or `t`)
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: Use the prices as of each transaction date (more precisely, each [posting date](/journal.html#posting-dates)).
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: Use the prices as of each transaction date (more precisely, each [posting's date](/journal.html#posting-dates)).
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Balance reports will show the sum of amount values.
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`--value-at=period` (or `p`)
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: Use the prices as of the last day of the report period (or each subperiod).
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: When no report period is specified, this will be the journal's last transaction date.
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: Use the prices as of the last day of the report period (or each subperiod in a multiperiod report).
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When no report period is specified, uses the journal's last transaction date.
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Balance reports will show the period-end value of summed amounts.
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`--value-at=now` (or `n`)
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: Use the prices as of today's date when the report is generated. This is the default.
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Balance reports will show the current value of summed amounts.
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`--value-at=YYYY-MM-DD`
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: Use the prices as of the given date (8 digits with `-` or `/` or `.` separators).
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: Eg `--value-at=2019-04-25`.
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Eg `--value-at=2019-04-25`.
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Balance reports will show the value on the given date of summed amounts.
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Here are some examples to show its effect:
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Here are the effects of `--value-at` as seen with `print`:
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```journal
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P 2000-01-01 A 1 B
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@ -556,7 +560,7 @@ $ hledger -f- print --value-at=period date:2000/01-2000/03
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```
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Or with no report period specified, show the value as of the last day of the journal (2000-03-01):
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With no report period specified, that shows the value as of the last day of the journal (2000-03-01):
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```shell
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$ hledger -f- print --value-at=period
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2000/01/01
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@ -570,7 +574,7 @@ $ hledger -f- print --value-at=period
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```
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Show the current value (the last declared price is still in effect today):
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Show the current value (the 2000-04-01 price is still in effect today):
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```shell
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$ hledger -f- print --value-at=now
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2000-01-01
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@ -600,36 +604,43 @@ $ hledger -f- print --value-at=2000-01-15
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### Effect of --value-at on reports
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There are many possible combinations of --value-at and hledger's various reports.
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Below is what we currently (aim to) do in each case.
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You're not expected to remember all this - probably only a few of these will be useful in practice -
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but when troubleshooting a report, look here.
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Below is how `--value-at` affects each of hledger's reports, currently.
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You're not expected to remember all this, but when troubleshooting a report, look here.
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If you find problems - useless reports, misbehaving reports, or error
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messages being printed - please report them (with reproducible examples) eg at
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[#329](https://github.com/simonmichael/hledger/issues/329).
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| Report type | `--value-at` `transaction` | `--value-at` `period` | `--value-at` `DATE`/`now` |
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|------------------------------------------|-----------------------------------------------------------|--------------------------------------------------------------|-------------------------------------------|
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| <br>**print** | | | |
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| posting amounts | value at posting date | value at report end | value at DATE |
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| balance assertions/assignments | show unvalued | show unvalued | show unvalued |
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| <br>**register** | | | |
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| starting balance with -H | value at day before report start | value at day before report start | value at DATE |
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| posting amounts | value at posting date | value at report end | value at DATE |
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| posting amounts, multiperiod | value each posting at posting date then summarise | value each summary posting at period end | value each summary posting at DATE |
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| <br>**balance (bs, cf, is..)** | | | |
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| starting balances with -H | sum of values of previous postings at their posting dates | value at day before report start of sum of previous postings | value at DATE of sum of previous postings |
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| balances, simple balance report | sum of values of each posting at posting date | value at period end of sum of postings | value at DATE of sum of postings |
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| balances, multiperiod report | sum of values of each posting at posting date | value at period end of sum of postings | value at DATE of sum of postings |
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| column totals | sum/average of the displayed balances | value at period end of sum of postings | value at DATE of sum of postings |
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| row totals/averages, grand total/average | sum/average of the displayed balances | value at period end of sum/average of postings | value at DATE of sum/average of postings |
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| budget amounts in --budget reports | ? | ? | ? |
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| Report type | `--value-at` `transaction` | `--value-at` `period` | `--value-at` `DATE`/`now` |
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|------------------------------------|-----------------------------------------------------------|--------------------------------------------------------------|-------------------------------------------|
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| <br>**print** | | | |
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| posting amounts | value at posting date | value at report end | value at DATE |
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| balance assertions/assignments | show unvalued | show unvalued | show unvalued |
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| <br>**register** | | | |
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| starting balance with -H | value at day before report start | value at day before report start | value at DATE |
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| posting amounts | value at posting date | value at report end | value at DATE |
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| posting amounts, multiperiod | value each posting at posting date then summarise | value each summary posting at period end | value each summary posting at DATE |
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| running total/average | sum/average of the displayed values | sum/average of the displayed values | sum/average of the displayed values |
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| <br>**balance (bs, cf, is..)** | | | |
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| starting balances with -H | sum of values of previous postings at their posting dates | value at day before report start of sum of previous postings | value at DATE of sum of previous postings |
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| balances, simple balance report | sum of values of each posting at posting date | value at period end of sum of postings | value at DATE of sum of postings |
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| balances, multiperiod report | sum of values of each posting at posting date | value at period end of sum of postings | value at DATE of sum of postings |
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| column/row/grand totals/averages | sum/average of the displayed values | value at period end of sum/average of postings | value at DATE of sum/average of postings |
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| budget amounts in --budget reports | ? | ? | ? |
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### Some useful value reports
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Here are some probably useful reports - please send suggestions if you find out more:
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| Command: | Description of report: | Could answer: |
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|------------------------------|----------------------------------------------------|--------------------------------------------------|
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| `hledger bs -M --value-at=p` | Monthly historical value of assets/liabilities | How are my investments performing ? |
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| `hledger is -M --value-at=t` | Monthly contemporaneous value of revenues/expenses | How much foreign currency have I been spending ? |
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## Combining -B and -V
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Using -B/--cost and -V/--value together is currently allowed, but the
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results are probably not meaningful. Let us know if you find a use for this.
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Using -B/--cost together with -V/--value or --value-at is allowed.
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Let us know if you find a use for this.
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## Output destination
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