I think the function get_timestamp return current system time. but current system timezone not GMT. 
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so get_timestamp return value is not GMT.
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may be have something that I miss it , please tell me.
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zhouxiaoqiang.mstech@gmail.com
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From: Di-Shi Sun
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Date: 2014-10-29 15:24
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To: OpenSIPS/opensips
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CC: xiaoqiang.zhou
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Subject: Re: [opensips] date format convert method that use in opensips.cfg (#378)
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It is possible to use get_timestamp to generate date/time string in GMT. :)
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It should be easier and enough to add a pvar for time in GMT if you only want to generate SIP Date header.
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