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cardano-testnet: Default to --update-time and add --no-update-time flag #6466

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cardano-testnet: Default to --update-time and add --no-update-time flag #6466

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37f0106
Default to `--update-time` and add `--no-update-time` flag
palas Feb 25, 2026
2344c52
Add changelog entry
palas Feb 25, 2026
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9 changes: 9 additions & 0 deletions cardano-testnet/changelog.d/20260226_005016_palas_default_to_update_timestamps.md
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@@ -0,0 +1,9 @@
### Added

- Added `--preserve-timestamps` flag. When set, genesis file timestamps are kept as-is.

### Changed

- Timestamps in genesis files are now updated to the current date by default.
- The `--update-time` flag is now internal (hidden, kept for backward compatibility).

13 changes: 8 additions & 5 deletions cardano-testnet/src/Parsers/Cardano.hs
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Expand Up @@ -134,11 +134,14 @@ pMainnetParams = OA.flag' OnChainParamsMainnet
)

pUpdateTimestamps :: Parser UpdateTimestamps
pUpdateTimestamps = OA.flag DontUpdateTimestamps UpdateTimestamps
( OA.long "update-time"
<> OA.help "Update the time stamps in genesis files to current date"
<> OA.showDefault
)
pUpdateTimestamps =
-- Default to UpdateTimestamps, because when using the two-step flow
-- (cardano-testnet create-env → cardano-testnet cardano --node-env),
-- genesis timestamps can become stale.
-- See https://github.com/IntersectMBO/cardano-node/issues/6455
OA.flag' UpdateTimestamps (OA.long "update-time" <> OA.help "Update the time stamps in genesis files to current date (default, kept for backward compatibility)" <> OA.internal)
<|> OA.flag' DontUpdateTimestamps (OA.long "preserve-timestamps" <> OA.help "Do not update the time stamps in genesis files to current date.")
<|> pure UpdateTimestamps

pEnvOutputDir :: Parser FilePath
pEnvOutputDir = OA.strOption
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2 changes: 1 addition & 1 deletion cardano-testnet/test/cardano-testnet-golden/files/golden/help.cli
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Expand Up @@ -13,7 +13,7 @@ Usage: cardano-testnet cardano [--num-pool-nodes COUNT]
[--slot-length SECONDS]
[--active-slots-coeff DOUBLE]
[--node-env FILEPATH]
[--update-time]
[--preserve-timestamps]
[--params-file FILEPATH | --params-mainnet]

Start a testnet and keep it running until stopped
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6 changes: 3 additions & 3 deletions cardano-testnet/test/cardano-testnet-golden/files/golden/help/cardano.cli
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Expand Up @@ -11,7 +11,7 @@ Usage: cardano-testnet cardano [--num-pool-nodes COUNT]
[--slot-length SECONDS]
[--active-slots-coeff DOUBLE]
[--node-env FILEPATH]
[--update-time]
[--preserve-timestamps]
[--params-file FILEPATH | --params-mainnet]

Start a testnet and keep it running until stopped
Expand Down Expand Up @@ -51,8 +51,8 @@ Available options:
otherwise). You can generate a default environment
with the 'create-env' command, then modify it and
pass it with this argument.
--update-time Update the time stamps in genesis files to current
date
--preserve-timestamps Do not update the time stamps in genesis files to
current date.
--params-file FILEPATH File containing custom on-chain parameters in
Blockfrost format:
https://docs.blockfrost.io/#tag/cardano--epochs/GET/epochs/latest/parameters
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