In Freeswitch dialplan, I know I can get today date using ${strftime(%Y%m%d}, but how do I get yesterday date correctly? I can do ${strftime(%Y%m)}${expr(${strftime(%d}-1)}, but what about yesterday date of Jan, 1st, 2017? Thanks for all your helps.In Freeswitch dialplan, I know I can get today
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我如何在Freeswitch获得昨天约会？
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