One-liner to convert and adjust a specified time in FreeBSD

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It's easy to accept a date in a specified but non-standard format (date -j -f "EXISTING_DATE_FORMAT" "EXISTING_DATE" "OUTPUT_FORMAT"), and easy to adjust a date with the same command (date -j -v+1y "OUTPUT_FORMAT").



I have a date/time in a text string, that I need to convert (so date can understand it) and then adjust, before echoing it in a given format.



Unfortunately date -j -v+1y -f "EXISTING_DATE_FORMAT" "EXISTING_DATE" "OUTPUT_FORMAT" doesn't seem to be permitted, or at least isn't working for me. How can I get this effect?






freebsd date







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  • Use a second date command inside $(command substitution) to convert from the existing format
    – Philippos
    Oct 9 '17 at 12:54










  • Can you enter this as an answer (hopefully with a simple example to show the exact syntax)? Then I can mark it as correct.
    – Stilez
    Oct 9 '17 at 13:12










  • Sorry, I only commented, because I don't have a FreeBSD machine to verify.
    – Philippos
    Oct 9 '17 at 13:56










  • Take the last example in the FreeBSD manual page for date as a further guide, and you can answer your own question. (-:
    – JdeBP
    Oct 9 '17 at 14:51














up vote
2
down vote

favorite












It's easy to accept a date in a specified but non-standard format (date -j -f "EXISTING_DATE_FORMAT" "EXISTING_DATE" "OUTPUT_FORMAT"), and easy to adjust a date with the same command (date -j -v+1y "OUTPUT_FORMAT").



I have a date/time in a text string, that I need to convert (so date can understand it) and then adjust, before echoing it in a given format.



Unfortunately date -j -v+1y -f "EXISTING_DATE_FORMAT" "EXISTING_DATE" "OUTPUT_FORMAT" doesn't seem to be permitted, or at least isn't working for me. How can I get this effect?






freebsd date







share|improve this question





















  • Use a second date command inside $(command substitution) to convert from the existing format
    – Philippos
    Oct 9 '17 at 12:54










  • Can you enter this as an answer (hopefully with a simple example to show the exact syntax)? Then I can mark it as correct.
    – Stilez
    Oct 9 '17 at 13:12










  • Sorry, I only commented, because I don't have a FreeBSD machine to verify.
    – Philippos
    Oct 9 '17 at 13:56










  • Take the last example in the FreeBSD manual page for date as a further guide, and you can answer your own question. (-:
    – JdeBP
    Oct 9 '17 at 14:51












up vote
2
down vote

favorite









up vote
2
down vote

favorite











It's easy to accept a date in a specified but non-standard format (date -j -f "EXISTING_DATE_FORMAT" "EXISTING_DATE" "OUTPUT_FORMAT"), and easy to adjust a date with the same command (date -j -v+1y "OUTPUT_FORMAT").



I have a date/time in a text string, that I need to convert (so date can understand it) and then adjust, before echoing it in a given format.



Unfortunately date -j -v+1y -f "EXISTING_DATE_FORMAT" "EXISTING_DATE" "OUTPUT_FORMAT" doesn't seem to be permitted, or at least isn't working for me. How can I get this effect?






freebsd date







share|improve this question













It's easy to accept a date in a specified but non-standard format (date -j -f "EXISTING_DATE_FORMAT" "EXISTING_DATE" "OUTPUT_FORMAT"), and easy to adjust a date with the same command (date -j -v+1y "OUTPUT_FORMAT").



I have a date/time in a text string, that I need to convert (so date can understand it) and then adjust, before echoing it in a given format.



Unfortunately date -j -v+1y -f "EXISTING_DATE_FORMAT" "EXISTING_DATE" "OUTPUT_FORMAT" doesn't seem to be permitted, or at least isn't working for me. How can I get this effect?






freebsd date




freebsd date






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Oct 9 '17 at 12:50









Stilez

441211




441211











  • Use a second date command inside $(command substitution) to convert from the existing format
    – Philippos
    Oct 9 '17 at 12:54










  • Can you enter this as an answer (hopefully with a simple example to show the exact syntax)? Then I can mark it as correct.
    – Stilez
    Oct 9 '17 at 13:12










  • Sorry, I only commented, because I don't have a FreeBSD machine to verify.
    – Philippos
    Oct 9 '17 at 13:56










  • Take the last example in the FreeBSD manual page for date as a further guide, and you can answer your own question. (-:
    – JdeBP
    Oct 9 '17 at 14:51
















  • Use a second date command inside $(command substitution) to convert from the existing format
    – Philippos
    Oct 9 '17 at 12:54










  • Can you enter this as an answer (hopefully with a simple example to show the exact syntax)? Then I can mark it as correct.
    – Stilez
    Oct 9 '17 at 13:12










  • Sorry, I only commented, because I don't have a FreeBSD machine to verify.
    – Philippos
    Oct 9 '17 at 13:56










  • Take the last example in the FreeBSD manual page for date as a further guide, and you can answer your own question. (-:
    – JdeBP
    Oct 9 '17 at 14:51















Use a second date command inside $(command substitution) to convert from the existing format
– Philippos
Oct 9 '17 at 12:54




Use a second date command inside $(command substitution) to convert from the existing format
– Philippos
Oct 9 '17 at 12:54












Can you enter this as an answer (hopefully with a simple example to show the exact syntax)? Then I can mark it as correct.
– Stilez
Oct 9 '17 at 13:12




Can you enter this as an answer (hopefully with a simple example to show the exact syntax)? Then I can mark it as correct.
– Stilez
Oct 9 '17 at 13:12












Sorry, I only commented, because I don't have a FreeBSD machine to verify.
– Philippos
Oct 9 '17 at 13:56




Sorry, I only commented, because I don't have a FreeBSD machine to verify.
– Philippos
Oct 9 '17 at 13:56












Take the last example in the FreeBSD manual page for date as a further guide, and you can answer your own question. (-:
– JdeBP
Oct 9 '17 at 14:51




Take the last example in the FreeBSD manual page for date as a further guide, and you can answer your own question. (-:
– JdeBP
Oct 9 '17 at 14:51















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